diff --git a/src/core/Chef.mjs b/src/core/Chef.mjs
index 9c52695e..a935d75c 100755
--- a/src/core/Chef.mjs
+++ b/src/core/Chef.mjs
@@ -91,8 +91,8 @@ class Chef {
 
         return {
             result: this.dish.type === Dish.HTML ?
-                this.dish.get(Dish.HTML, notUTF8) :
-                this.dish.get(returnType, notUTF8),
+                await this.dish.get(Dish.HTML, notUTF8) :
+                await this.dish.get(returnType, notUTF8),
             type: Dish.enumLookup(this.dish.type),
             progress: progress,
             duration: new Date().getTime() - startTime,
diff --git a/src/core/Dish.mjs b/src/core/Dish.mjs
index 792395c1..6aeaf3e9 100755
--- a/src/core/Dish.mjs
+++ b/src/core/Dish.mjs
@@ -51,6 +51,8 @@ class Dish {
             case "bignumber":
             case "big number":
                 return Dish.BIG_NUMBER;
+            case "list<file>":
+                return Dish.LIST_FILE;
             default:
                 throw "Invalid data type string. No matching enum.";
         }
@@ -77,6 +79,8 @@ class Dish {
                 return "ArrayBuffer";
             case Dish.BIG_NUMBER:
                 return "BigNumber";
+            case Dish.LIST_FILE:
+                return "List<File>";
             default:
                 throw "Invalid data type enum. No matching type.";
         }
@@ -86,7 +90,7 @@ class Dish {
     /**
      * Sets the data value and type and then validates them.
      *
-     * @param {byteArray|string|number|ArrayBuffer|BigNumber} value
+     * @param {*} value
      *     - The value of the input data.
      * @param {number} type
      *     - The data type of value, see Dish enums.
@@ -112,15 +116,14 @@ class Dish {
      *
      * @param {number} type - The data type of value, see Dish enums.
      * @param {boolean} [notUTF8=false] - Do not treat strings as UTF8.
-     * @returns {byteArray|string|number|ArrayBuffer|BigNumber}
-     *     The value of the output data.
+     * @returns {*} - The value of the output data.
      */
-    get(type, notUTF8=false) {
+    async get(type, notUTF8=false) {
         if (typeof type === "string") {
             type = Dish.typeEnum(type);
         }
         if (this.type !== type) {
-            this.translate(type, notUTF8);
+            await this._translate(type, notUTF8);
         }
         return this.value;
     }
@@ -132,7 +135,7 @@ class Dish {
      * @param {number} toType - The data type of value, see Dish enums.
      * @param {boolean} [notUTF8=false] - Do not treat strings as UTF8.
      */
-    translate(toType, notUTF8=false) {
+    async _translate(toType, notUTF8=false) {
         log.debug(`Translating Dish from ${Dish.enumLookup(this.type)} to ${Dish.enumLookup(toType)}`);
         const byteArrayToStr = notUTF8 ? Utils.byteArrayToChars : Utils.byteArrayToUtf8;
 
@@ -142,7 +145,7 @@ class Dish {
                 this.value = this.value ? Utils.strToByteArray(this.value) : [];
                 break;
             case Dish.NUMBER:
-                this.value = typeof this.value == "number" ? Utils.strToByteArray(this.value.toString()) : [];
+                this.value = typeof this.value === "number" ? Utils.strToByteArray(this.value.toString()) : [];
                 break;
             case Dish.HTML:
                 this.value = this.value ? Utils.strToByteArray(Utils.unescapeHtml(Utils.stripHtmlTags(this.value, true))) : [];
@@ -154,6 +157,11 @@ class Dish {
             case Dish.BIG_NUMBER:
                 this.value = this.value instanceof BigNumber ? Utils.strToByteArray(this.value.toFixed()) : [];
                 break;
+            case Dish.LIST_FILE:
+                this.value = await Promise.all(this.value.map(async f => Utils.readFile(f)));
+                this.value = this.value.map(b => Array.prototype.slice.call(b));
+                this.value = [].concat.apply([], this.value);
+                break;
             default:
                 break;
         }
@@ -183,6 +191,10 @@ class Dish {
                 }
                 this.type = Dish.BIG_NUMBER;
                 break;
+            case Dish.LIST_FILE:
+                this.value = new File(this.value, "unknown");
+                this.type = Dish.LIST_FILE;
+                break;
             default:
                 break;
         }
@@ -220,6 +232,9 @@ class Dish {
                 return this.value instanceof ArrayBuffer;
             case Dish.BIG_NUMBER:
                 return this.value instanceof BigNumber;
+            case Dish.LIST_FILE:
+                return this.value instanceof Array &&
+                    this.value.reduce((acc, curr) => acc && curr instanceof File, true);
             default:
                 return false;
         }
@@ -244,6 +259,8 @@ class Dish {
                 return this.value.toString().length;
             case Dish.ARRAY_BUFFER:
                 return this.value.byteLength;
+            case Dish.LIST_FILE:
+                return this.value.reduce((acc, curr) => acc + curr.size, 0);
             default:
                 return -1;
         }
@@ -288,6 +305,12 @@ Dish.ARRAY_BUFFER = 4;
  * @enum
  */
 Dish.BIG_NUMBER = 5;
+/**
+ * Dish data type enum for lists of files.
+ * @readonly
+ * @enum
+ */
+Dish.LIST_FILE = 6;
 
 
 export default Dish;
diff --git a/src/core/FlowControl.js b/src/core/FlowControl.js
index 73f29d78..92440c49 100755
--- a/src/core/FlowControl.js
+++ b/src/core/FlowControl.js
@@ -26,7 +26,7 @@ const FlowControl = {
         const opList     = state.opList,
             inputType    = opList[state.progress].inputType,
             outputType   = opList[state.progress].outputType,
-            input        = state.dish.get(inputType),
+            input        = await state.dish.get(inputType),
             ings         = opList[state.progress].ingValues,
             splitDelim   = ings[0],
             mergeDelim   = ings[1],
@@ -77,7 +77,7 @@ const FlowControl = {
                 }
                 progress = err.progress + 1;
             }
-            output += dish.get(outputType) + mergeDelim;
+            output += await dish.get(outputType) + mergeDelim;
         }
 
         state.dish.set(output, outputType);
@@ -111,7 +111,7 @@ const FlowControl = {
      * @param {Operation[]} state.opList - The list of operations in the recipe.
      * @returns {Object} The updated state of the recipe.
      */
-    runRegister: function(state) {
+    runRegister: async function(state) {
         const ings = state.opList[state.progress].ingValues,
             extractorStr = ings[0],
             i = ings[1],
@@ -122,7 +122,7 @@ const FlowControl = {
         if (m) modifiers += "m";
 
         const extractor = new RegExp(extractorStr, modifiers),
-            input = state.dish.get(Dish.STRING),
+            input = await state.dish.get(Dish.STRING),
             registers = input.match(extractor);
 
         if (!registers) return state;
@@ -208,7 +208,7 @@ const FlowControl = {
      * @param {number} state.numJumps - The number of jumps taken so far.
      * @returns {Object} The updated state of the recipe.
      */
-    runCondJump: function(state) {
+    runCondJump: async function(state) {
         const ings     = state.opList[state.progress].ingValues,
             dish     = state.dish,
             regexStr = ings[0],
@@ -223,7 +223,7 @@ const FlowControl = {
         }
 
         if (regexStr !== "") {
-            const strMatch = dish.get(Dish.STRING).search(regexStr) > -1;
+            const strMatch = await dish.get(Dish.STRING).search(regexStr) > -1;
             if (!invert && strMatch || invert && !strMatch) {
                 state.progress = jmpIndex;
                 state.numJumps++;
diff --git a/src/core/Operation.mjs b/src/core/Operation.mjs
index 30ad71e4..e87c31f4 100755
--- a/src/core/Operation.mjs
+++ b/src/core/Operation.mjs
@@ -19,6 +19,7 @@ class Operation {
         // Private fields
         this._inputType       = -1;
         this._outputType      = -1;
+        this._presentType     = -1;
         this._breakpoint      = false;
         this._disabled        = false;
         this._flowControl     = false;
@@ -71,6 +72,22 @@ class Operation {
     }
 
 
+    /**
+     * Method to be called when displaying the result of an operation in a human-readable
+     * format. This allows operations to return usable data from their run() method and
+     * only format them when this method is called.
+     *
+     * The default action is to return the data unchanged, but child classes can override
+     * this behaviour.
+     *
+     * @param {*} data - The result of the run() function
+     * @returns {*} - A human-readable version of the data
+     */
+    present(data) {
+        return data;
+    }
+
+
     /**
      * Sets the input type as a Dish enum.
      *
@@ -98,6 +115,7 @@ class Operation {
      */
     set outputType(typeStr) {
         this._outputType = Dish.typeEnum(typeStr);
+        if (this._presentType < 0) this._presentType = this._outputType;
     }
 
 
@@ -111,6 +129,26 @@ class Operation {
     }
 
 
+    /**
+     * Sets the presentation type as a Dish enum.
+     *
+     * @param {string} typeStr
+     */
+    set presentType(typeStr) {
+        this._presentType = Dish.typeEnum(typeStr);
+    }
+
+
+    /**
+     * Gets the presentation type as a readable string.
+     *
+     * @returns {string}
+     */
+    get presentType() {
+        return Dish.enumLookup(this._presentType);
+    }
+
+
     /**
      * Sets the args for the current operation.
      *
diff --git a/src/core/Recipe.mjs b/src/core/Recipe.mjs
index 7afaeab9..14792157 100755
--- a/src/core/Recipe.mjs
+++ b/src/core/Recipe.mjs
@@ -130,7 +130,7 @@ class Recipe  {
      *     - The final progress through the recipe
      */
     async execute(dish, startFrom=0, forkState={}) {
-        let op, input, output,
+        let op, input, output, lastRunOp,
             numJumps = 0,
             numRegisters = forkState.numRegisters || 0;
 
@@ -149,7 +149,7 @@ class Recipe  {
             }
 
             try {
-                input = dish.get(op.inputType);
+                input = await dish.get(op.inputType);
                 log.debug("Executing operation");
 
                 if (op.flowControl) {
@@ -169,6 +169,7 @@ class Recipe  {
                     numRegisters = state.numRegisters;
                 } else {
                     output = await op.run(input, op.ingValues);
+                    lastRunOp = op;
                     dish.set(output, op.outputType);
                 }
             } catch (err) {
@@ -187,6 +188,11 @@ class Recipe  {
             }
         }
 
+        // Present the results of the final operation
+        // TODO try/catch
+        output = await lastRunOp.present(output);
+        dish.set(output, lastRunOp.presentType);
+
         log.debug("Recipe complete");
         return this.opList.length;
     }
diff --git a/src/core/Utils.mjs b/src/core/Utils.mjs
index 2be207eb..88cfa52e 100755
--- a/src/core/Utils.mjs
+++ b/src/core/Utils.mjs
@@ -812,35 +812,30 @@ class Utils {
 
     /**
      * Formats a list of files or directories.
-     * A File is an object with a "fileName" and optionally a "contents".
-     * If the fileName ends with "/" and the contents is of length 0 then
-     * it is considered a directory.
      *
      * @author tlwr [toby@toby.codes]
+     * @author n1474335 [n1474335@gmail.com]
      *
-     * @param {Object[]} files
+     * @param {File[]} files
      * @returns {html}
      */
-    static displayFilesAsHTML(files) {
-        /* <NL> and <SP> used to denote newlines and spaces in HTML markup.
-         * If a non-html operation is used, all markup will be removed but these
-         * whitespace chars will remain for formatting purposes.
-         */
-
+    static async displayFilesAsHTML(files) {
         const formatDirectory = function(file) {
             const html = `<div class='panel panel-default' style='white-space: normal;'>
                     <div class='panel-heading' role='tab'>
                         <h4 class='panel-title'>
-                            <NL>${Utils.escapeHtml(file.fileName)}
+                            ${Utils.escapeHtml(file.name)}
                         </h4>
                     </div>
                 </div>`;
             return html;
         };
 
-        const formatFile = function(file, i) {
+        const formatFile = async function(file, i) {
+            const buff = await Utils.readFile(file);
+            const fileStr = Utils.arrayBufferToStr(buff.buffer);
             const blob = new Blob(
-                [new Uint8Array(file.bytes)],
+                [buff],
                 {type: "octet/stream"}
             );
             const blobUrl = URL.createObjectURL(blob);
@@ -850,13 +845,13 @@ class Utils {
                 data-toggle='collapse'
                 aria-expanded='true'
                 aria-controls='collapse${i}'
-                title="Show/hide contents of '${Utils.escapeHtml(file.fileName)}'">&#x1f441;&#xfe0f;</a>`;
+                title="Show/hide contents of '${Utils.escapeHtml(file.name)}'">&#x1f441;&#xfe0f;</a>`;
 
             const downloadFileElem = `<a href='${blobUrl}'
-                title='Download ${Utils.escapeHtml(file.fileName)}'
-                download='${Utils.escapeHtml(file.fileName)}'>&#x1f4be;</a>`;
+                title='Download ${Utils.escapeHtml(file.name)}'
+                download='${Utils.escapeHtml(file.name)}'>&#x1f4be;</a>`;
 
-            const hexFileData = toHexFast(new Uint8Array(file.bytes));
+            const hexFileData = toHexFast(buff);
 
             const switchToInputElem = `<a href='#switchFileToInput${i}'
                 class='file-switch'
@@ -867,12 +862,12 @@ class Utils {
                     <div class='panel-heading' role='tab' id='heading${i}'>
                         <h4 class='panel-title'>
                             <div>
-                                ${Utils.escapeHtml(file.fileName)}<NL>
-                                ${viewFileElem}<SP>
-                                ${downloadFileElem}<SP>
-                                ${switchToInputElem}<SP>
+                                ${Utils.escapeHtml(file.name)}
+                                ${viewFileElem}
+                                ${downloadFileElem}
+                                ${switchToInputElem}
                                 <span class='pull-right'>
-                                    <NL>${file.size.toLocaleString()} bytes
+                                    ${file.size.toLocaleString()} bytes
                                 </span>
                             </div>
                         </h4>
@@ -880,7 +875,7 @@ class Utils {
                     <div id='collapse${i}' class='panel-collapse collapse'
                         role='tabpanel' aria-labelledby='heading${i}'>
                         <div class='panel-body'>
-                            <NL><NL><pre><code>${Utils.escapeHtml(file.contents)}</code></pre>
+                            <pre><code>${Utils.escapeHtml(fileStr)}</code></pre>
                         </div>
                     </div>
                 </div>`;
@@ -891,17 +886,15 @@ class Utils {
                 ${files.length} file(s) found<NL>
             </div>`;
 
-        files.forEach(function(file, i) {
-            if (typeof file.contents !== "undefined") {
-                html += formatFile(file, i);
+        for (let i = 0; i < files.length; i++) {
+            if (files[i].name.endsWith("/")) {
+                html += formatDirectory(files[i]);
             } else {
-                html += formatDirectory(file);
+                html += await formatFile(files[i], i);
             }
-        });
+        }
 
-        return html.replace(/(?:(<pre>(?:\n|.)*<\/pre>)|\s{2,})/g, "$1") // Remove whitespace from markup
-            .replace(/<NL>/g, "\n") // Replace <NP> with newlines
-            .replace(/<SP>/g, " "); // Replace <SP> with spaces
+        return html;
     }
 
 
@@ -941,6 +934,47 @@ class Utils {
     }
 
 
+    /**
+     * Reads a File and returns the data as a Uint8Array.
+     *
+     * @param {File} file
+     * @returns {Uint8Array}
+     *
+     * @example
+     * // returns Uint8Array(5) [104, 101, 108, 108, 111]
+     * await Utils.readFile(new File(["hello"], "test"))
+     */
+    static readFile(file) {
+        return new Promise((resolve, reject) => {
+            const reader = new FileReader();
+            const data = new Uint8Array(file.size);
+            let offset = 0;
+            const CHUNK_SIZE = 10485760; // 10MiB
+
+            const seek = function() {
+                if (offset >= file.size) {
+                    resolve(data);
+                    return;
+                }
+                const slice = file.slice(offset, offset + CHUNK_SIZE);
+                reader.readAsArrayBuffer(slice);
+            };
+
+            reader.onload = function(e) {
+                data.set(new Uint8Array(reader.result), offset);
+                offset += CHUNK_SIZE;
+                seek();
+            };
+
+            reader.onerror = function(e) {
+                reject(reader.error.message);
+            };
+
+            seek();
+        });
+    }
+
+
     /**
      * Actual modulo function, since % is actually the remainder function in JS.
      *
diff --git a/src/core/config/Categories.js b/src/core/config/Categories.js
index 7bb323d7..70e4ea4b 100755
--- a/src/core/config/Categories.js
+++ b/src/core/config/Categories.js
@@ -84,8 +84,8 @@ const Categories = [
     //         "RC2 Decrypt",
     //         "RC4",
     //         "RC4 Drop",
-    //         "ROT13",
-    //         "ROT47",
+            "ROT13",
+            "ROT47",
     //         "XOR",
     //         "XOR Brute Force",
     //         "Vigenère Encode",
@@ -141,9 +141,9 @@ const Categories = [
     //         "Standard Deviation",
     //         "Bit shift left",
     //         "Bit shift right",
-    //         "Rotate left",
-    //         "Rotate right",
-    //         "ROT13",
+            "Rotate left",
+            "Rotate right",
+            "ROT13"
         ]
     },
     // {
diff --git a/src/core/config/OperationConfig.json b/src/core/config/OperationConfig.json
index fd91946d..63e17ea5 100644
--- a/src/core/config/OperationConfig.json
+++ b/src/core/config/OperationConfig.json
@@ -188,6 +188,44 @@
             }
         ]
     },
+    "ROT13": {
+        "module": "Default",
+        "description": "A simple caesar substitution cipher which rotates alphabet characters by the specified amount (default 13).",
+        "inputType": "byteArray",
+        "outputType": "byteArray",
+        "flowControl": false,
+        "args": [
+            {
+                "name": "Rotate lower case chars",
+                "type": "boolean",
+                "value": true
+            },
+            {
+                "name": "Rotate upper case chars",
+                "type": "boolean",
+                "value": true
+            },
+            {
+                "name": "Amount",
+                "type": "number",
+                "value": 13
+            }
+        ]
+    },
+    "ROT47": {
+        "module": "Default",
+        "description": "A slightly more complex variation of a caesar cipher, which includes ASCII characters from 33 '!' to 126 '~'. Default rotation: 47.",
+        "inputType": "byteArray",
+        "outputType": "byteArray",
+        "flowControl": false,
+        "args": [
+            {
+                "name": "Amount",
+                "type": "number",
+                "value": 47
+            }
+        ]
+    },
     "Raw Deflate": {
         "module": "Default",
         "description": "Compresses data using the deflate algorithm with no headers.",
@@ -243,6 +281,44 @@
             }
         ]
     },
+    "Rotate left": {
+        "module": "Default",
+        "description": "Rotates each byte to the left by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.",
+        "inputType": "byteArray",
+        "outputType": "byteArray",
+        "flowControl": false,
+        "args": [
+            {
+                "name": "Amount",
+                "type": "number",
+                "value": 1
+            },
+            {
+                "name": "Carry through",
+                "type": "boolean",
+                "value": false
+            }
+        ]
+    },
+    "Rotate right": {
+        "module": "Default",
+        "description": "Rotates each byte to the right by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.",
+        "inputType": "byteArray",
+        "outputType": "byteArray",
+        "flowControl": false,
+        "args": [
+            {
+                "name": "Amount",
+                "type": "number",
+                "value": 1
+            },
+            {
+                "name": "Carry through",
+                "type": "boolean",
+                "value": false
+            }
+        ]
+    },
     "Set Difference": {
         "module": "Default",
         "description": "Get the Difference of two sets",
diff --git a/src/core/config/modules/Default.mjs b/src/core/config/modules/Default.mjs
index 3aaab5ad..d41cde05 100644
--- a/src/core/config/modules/Default.mjs
+++ b/src/core/config/modules/Default.mjs
@@ -10,7 +10,11 @@ import FromBase32 from "../../operations/FromBase32";
 import FromBase64 from "../../operations/FromBase64";
 import FromHex from "../../operations/FromHex";
 import PowerSet from "../../operations/PowerSet";
+import ROT13 from "../../operations/ROT13";
+import ROT47 from "../../operations/ROT47";
 import RawDeflate from "../../operations/RawDeflate";
+import RotateLeft from "../../operations/RotateLeft";
+import RotateRight from "../../operations/RotateRight";
 import SetDifference from "../../operations/SetDifference";
 import SetIntersection from "../../operations/SetIntersection";
 import SetUnion from "../../operations/SetUnion";
@@ -28,7 +32,11 @@ OpModules.Default = {
     "From Base64": FromBase64,
     "From Hex": FromHex,
     "Power Set": PowerSet,
+    "ROT13": ROT13,
+    "ROT47": ROT47,
     "Raw Deflate": RawDeflate,
+    "Rotate left": RotateLeft,
+    "Rotate right": RotateRight,
     "Set Difference": SetDifference,
     "Set Intersection": SetIntersection,
     "Set Union": SetUnion,
diff --git a/src/core/config/scripts/generateConfig.mjs b/src/core/config/scripts/generateConfig.mjs
index 7af17cc9..6a9f12ae 100644
--- a/src/core/config/scripts/generateConfig.mjs
+++ b/src/core/config/scripts/generateConfig.mjs
@@ -38,7 +38,7 @@ for (const opObj in Ops) {
         module: op.module,
         description: op.description,
         inputType: op.inputType,
-        outputType: op.outputType,
+        outputType: op.presentType,
         flowControl: op.flowControl,
         args: op.args
     };
diff --git a/src/core/lib/Rotate.mjs b/src/core/lib/Rotate.mjs
new file mode 100644
index 00000000..8d70fb25
--- /dev/null
+++ b/src/core/lib/Rotate.mjs
@@ -0,0 +1,103 @@
+/**
+ * Bit rotation functions.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ *
+ * @todo Support for UTF16
+ */
+
+
+/**
+ * Runs rotation operations across the input data.
+ *
+ * @param {byteArray} data
+ * @param {number} amount
+ * @param {function} algo - The rotation operation to carry out
+ * @returns {byteArray}
+ */
+export function rot(data, amount, algo) {
+    const result = [];
+    for (let i = 0; i < data.length; i++) {
+        let b = data[i];
+        for (let j = 0; j < amount; j++) {
+            b = algo(b);
+        }
+        result.push(b);
+    }
+    return result;
+}
+
+
+/**
+ * Rotate right bitwise op.
+ *
+ * @param {byte} b
+ * @returns {byte}
+ */
+export function rotr(b) {
+    const bit = (b & 1) << 7;
+    return (b >> 1) | bit;
+}
+
+/**
+ * Rotate left bitwise op.
+ *
+ * @param {byte} b
+ * @returns {byte}
+ */
+export function rotl(b) {
+    const bit = (b >> 7) & 1;
+    return ((b << 1) | bit) & 0xFF;
+}
+
+
+/**
+ * Rotates a byte array to the right by a specific amount as a whole, so that bits are wrapped
+ * from the end of the array to the beginning.
+ *
+ * @param {byteArray} data
+ * @param {number} amount
+ * @returns {byteArray}
+ */
+export function rotrCarry(data, amount) {
+    const result = [];
+    let carryBits = 0,
+        newByte;
+
+    amount = amount % 8;
+    for (let i = 0; i < data.length; i++) {
+        const oldByte = data[i] >>> 0;
+        newByte = (oldByte >> amount) | carryBits;
+        carryBits = (oldByte & (Math.pow(2, amount)-1)) << (8-amount);
+        result.push(newByte);
+    }
+    result[0] |= carryBits;
+    return result;
+}
+
+
+/**
+ * Rotates a byte array to the left by a specific amount as a whole, so that bits are wrapped
+ * from the beginning of the array to the end.
+ *
+ * @param {byteArray} data
+ * @param {number} amount
+ * @returns {byteArray}
+ */
+export function rotlCarry(data, amount) {
+    const result = [];
+    let carryBits = 0,
+        newByte;
+
+    amount = amount % 8;
+    for (let i = data.length-1; i >= 0; i--) {
+        const oldByte = data[i];
+        newByte = ((oldByte << amount) | carryBits) & 0xFF;
+        carryBits = (oldByte >> (8-amount)) & (Math.pow(2, amount)-1);
+        result[i] = (newByte);
+    }
+    result[data.length-1] = result[data.length-1] | carryBits;
+    return result;
+}
diff --git a/src/core/operations/ROT13.mjs b/src/core/operations/ROT13.mjs
new file mode 100644
index 00000000..d3e4e75a
--- /dev/null
+++ b/src/core/operations/ROT13.mjs
@@ -0,0 +1,103 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+
+
+/**
+ * ROT13 operation.
+ */
+class ROT13 extends Operation {
+
+    /**
+     * ROT13 constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "ROT13";
+        this.module = "Default";
+        this.description = "A simple caesar substitution cipher which rotates alphabet characters by the specified amount (default 13).";
+        this.inputType = "byteArray";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                name: "Rotate lower case chars",
+                type: "boolean",
+                value: true
+            },
+            {
+                name: "Rotate upper case chars",
+                type: "boolean",
+                value: true
+            },
+            {
+                name: "Amount",
+                type: "number",
+                value: 13
+            },
+        ];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        const output = input,
+            rot13Lowercase = args[0],
+            rot13Upperacse = args[1];
+        let amount = args[2],
+            chr;
+
+        if (amount) {
+            if (amount < 0) {
+                amount = 26 - (Math.abs(amount) % 26);
+            }
+
+            for (let i = 0; i < input.length; i++) {
+                chr = input[i];
+                if (rot13Upperacse && chr >= 65 && chr <= 90) { // Upper case
+                    chr = (chr - 65 + amount) % 26;
+                    output[i] = chr + 65;
+                } else if (rot13Lowercase && chr >= 97 && chr <= 122) { // Lower case
+                    chr = (chr - 97 + amount) % 26;
+                    output[i] = chr + 97;
+                }
+            }
+        }
+        return output;
+    }
+
+    /**
+     * Highlight ROT13
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlight(pos, args) {
+        return pos;
+    }
+
+    /**
+     * Highlight ROT13 in reverse
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlightReverse(pos, args) {
+        return pos;
+    }
+}
+
+export default ROT13;
diff --git a/src/core/operations/ROT47.mjs b/src/core/operations/ROT47.mjs
new file mode 100644
index 00000000..e0722670
--- /dev/null
+++ b/src/core/operations/ROT47.mjs
@@ -0,0 +1,88 @@
+/**
+ * @author Matt C [matt@artemisbot.uk]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+
+
+/**
+ * ROT47 operation.
+ */
+class ROT47 extends Operation {
+
+    /**
+     * ROT47 constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "ROT47";
+        this.module = "Default";
+        this.description = "A slightly more complex variation of a caesar cipher, which includes ASCII characters from 33 '!' to 126 '~'. Default rotation: 47.";
+        this.inputType = "byteArray";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                name: "Amount",
+                type: "number",
+                value: 47
+            },
+        ];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        const output = input;
+        let amount = args[0],
+            chr;
+
+        if (amount) {
+            if (amount < 0) {
+                amount = 94 - (Math.abs(amount) % 94);
+            }
+
+            for (let i = 0; i < input.length; i++) {
+                chr = input[i];
+                if (chr >= 33 && chr <= 126) {
+                    chr = (chr - 33 + amount) % 94;
+                    output[i] = chr + 33;
+                }
+            }
+        }
+        return output;
+    }
+
+    /**
+     * Highlight ROT47
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlight(pos, args) {
+        return pos;
+    }
+
+    /**
+     * Highlight ROT47 in reverse
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlightReverse(pos, args) {
+        return pos;
+    }
+}
+
+export default ROT47;
diff --git a/src/core/operations/RotateLeft.mjs b/src/core/operations/RotateLeft.mjs
new file mode 100644
index 00000000..d21e0def
--- /dev/null
+++ b/src/core/operations/RotateLeft.mjs
@@ -0,0 +1,81 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import {rot, rotl, rotlCarry} from "../lib/Rotate";
+
+
+/**
+ * Rotate left operation.
+ */
+class RotateLeft extends Operation {
+
+    /**
+     * RotateLeft constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Rotate left";
+        this.module = "Default";
+        this.description = "Rotates each byte to the left by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.";
+        this.inputType = "byteArray";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                name: "Amount",
+                type: "number",
+                value: 1
+            },
+            {
+                name: "Carry through",
+                type: "boolean",
+                value: false
+            }
+        ];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        if (args[1]) {
+            return rotlCarry(input, args[0]);
+        } else {
+            return rot(input, args[0], rotl);
+        }
+    }
+
+    /**
+     * Highlight rotate left
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlight(pos, args) {
+        return pos;
+    }
+
+    /**
+     * Highlight rotate left in reverse
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlightReverse(pos, args) {
+        return pos;
+    }
+}
+
+export default RotateLeft;
diff --git a/src/core/operations/RotateRight.mjs b/src/core/operations/RotateRight.mjs
new file mode 100644
index 00000000..f4a35cb6
--- /dev/null
+++ b/src/core/operations/RotateRight.mjs
@@ -0,0 +1,81 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import {rot, rotr, rotrCarry} from "../lib/Rotate";
+
+
+/**
+ * Rotate right operation.
+ */
+class RotateRight extends Operation {
+
+    /**
+     * RotateRight constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Rotate right";
+        this.module = "Default";
+        this.description = "Rotates each byte to the right by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.";
+        this.inputType = "byteArray";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                name: "Amount",
+                type: "number",
+                value: 1
+            },
+            {
+                name: "Carry through",
+                type: "boolean",
+                value: false
+            }
+        ];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        if (args[1]) {
+            return rotrCarry(input, args[0]);
+        } else {
+            return rot(input, args[0], rotr);
+        }
+    }
+
+    /**
+     * Highlight rotate right
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlight(pos, args) {
+        return pos;
+    }
+
+    /**
+     * Highlight rotate right in reverse
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlightReverse(pos, args) {
+        return pos;
+    }
+}
+
+export default RotateRight;
diff --git a/src/core/operations/Unzip.mjs b/src/core/operations/Unzip.mjs
index 1444551a..07f2a65e 100644
--- a/src/core/operations/Unzip.mjs
+++ b/src/core/operations/Unzip.mjs
@@ -25,7 +25,8 @@ class Unzip extends Operation {
         this.module = "Compression";
         this.description = "Decompresses data using the PKZIP algorithm and displays it per file, with support for passwords.";
         this.inputType = "byteArray";
-        this.outputType = "html";
+        this.outputType = "List<File>";
+        this.presentType = "html";
         this.args = [
             {
                 name: "Password",
@@ -43,7 +44,7 @@ class Unzip extends Operation {
     /**
      * @param {byteArray} input
      * @param {Object[]} args
-     * @returns {html}
+     * @returns {File[]}
      */
     run(input, args) {
         const options = {
@@ -51,28 +52,22 @@ class Unzip extends Operation {
                 verify: args[1]
             },
             unzip = new Zlib.Unzip(input, options),
-            filenames = unzip.getFilenames(),
-            files = [];
+            filenames = unzip.getFilenames();
 
-        filenames.forEach(function(fileName) {
+        return filenames.map(fileName => {
             const bytes = unzip.decompress(fileName);
-            const contents = Utils.byteArrayToUtf8(bytes);
-
-            const file = {
-                fileName: fileName,
-                size: contents.length,
-            };
-
-            const isDir = contents.length === 0 && fileName.endsWith("/");
-            if (!isDir) {
-                file.bytes = bytes;
-                file.contents = contents;
-            }
-
-            files.push(file);
+            return new File([bytes], fileName);
         });
+    }
 
-        return Utils.displayFilesAsHTML(files);
+    /**
+     * Displays the files in HTML for web apps.
+     *
+     * @param {File[]} files
+     * @returns {html}
+     */
+    async present(files) {
+        return await Utils.displayFilesAsHTML(files);
     }
 
 }
diff --git a/src/core/operations/index.mjs b/src/core/operations/index.mjs
index bd3ff94c..fff714d2 100644
--- a/src/core/operations/index.mjs
+++ b/src/core/operations/index.mjs
@@ -12,8 +12,12 @@ import FromHex from "./FromHex";
 import Gunzip from "./Gunzip";
 import Gzip from "./Gzip";
 import PowerSet from "./PowerSet";
+import ROT13 from "./ROT13";
+import ROT47 from "./ROT47";
 import RawDeflate from "./RawDeflate";
 import RawInflate from "./RawInflate";
+import RotateLeft from "./RotateLeft";
+import RotateRight from "./RotateRight";
 import SetDifference from "./SetDifference";
 import SetIntersection from "./SetIntersection";
 import SetUnion from "./SetUnion";
@@ -35,8 +39,12 @@ export {
     Gunzip,
     Gzip,
     PowerSet,
+    ROT13,
+    ROT47,
     RawDeflate,
     RawInflate,
+    RotateLeft,
+    RotateRight,
     SetDifference,
     SetIntersection,
     SetUnion,
diff --git a/src/core/operations/legacy/Rotate.js b/src/core/operations/legacy/Rotate.js
deleted file mode 100755
index 9125e575..00000000
--- a/src/core/operations/legacy/Rotate.js
+++ /dev/null
@@ -1,244 +0,0 @@
-/**
- * Bit rotation operations.
- *
- * @author n1474335 [n1474335@gmail.com]
- * @copyright Crown Copyright 2016
- * @license Apache-2.0
- *
- * @namespace
- *
- * @todo Support for UTF16
- */
-const Rotate = {
-
-    /**
-     * @constant
-     * @default
-     */
-    ROTATE_AMOUNT: 1,
-    /**
-     * @constant
-     * @default
-     */
-    ROTATE_CARRY: false,
-
-    /**
-     * Runs rotation operations across the input data.
-     *
-     * @private
-     * @param {byteArray} data
-     * @param {number} amount
-     * @param {function} algo - The rotation operation to carry out
-     * @returns {byteArray}
-     */
-    _rot: function(data, amount, algo) {
-        const result = [];
-        for (let i = 0; i < data.length; i++) {
-            let b = data[i];
-            for (let j = 0; j < amount; j++) {
-                b = algo(b);
-            }
-            result.push(b);
-        }
-        return result;
-    },
-
-
-    /**
-     * Rotate right operation.
-     *
-     * @param {byteArray} input
-     * @param {Object[]} args
-     * @returns {byteArray}
-     */
-    runRotr: function(input, args) {
-        if (args[1]) {
-            return Rotate._rotrCarry(input, args[0]);
-        } else {
-            return Rotate._rot(input, args[0], Rotate._rotr);
-        }
-    },
-
-
-    /**
-     * Rotate left operation.
-     *
-     * @param {byteArray} input
-     * @param {Object[]} args
-     * @returns {byteArray}
-     */
-    runRotl: function(input, args) {
-        if (args[1]) {
-            return Rotate._rotlCarry(input, args[0]);
-        } else {
-            return Rotate._rot(input, args[0], Rotate._rotl);
-        }
-    },
-
-
-    /**
-     * @constant
-     * @default
-     */
-    ROT13_AMOUNT: 13,
-    /**
-     * @constant
-     * @default
-     */
-    ROT13_LOWERCASE: true,
-    /**
-     * @constant
-     * @default
-     */
-    ROT13_UPPERCASE: true,
-
-    /**
-     * ROT13 operation.
-     *
-     * @param {byteArray} input
-     * @param {Object[]} args
-     * @returns {byteArray}
-     */
-    runRot13: function(input, args) {
-        let amount = args[2],
-            output = input,
-            chr,
-            rot13Lowercase = args[0],
-            rot13Upperacse = args[1];
-
-        if (amount) {
-            if (amount < 0) {
-                amount = 26 - (Math.abs(amount) % 26);
-            }
-
-            for (let i = 0; i < input.length; i++) {
-                chr = input[i];
-                if (rot13Upperacse && chr >= 65 && chr <= 90) { // Upper case
-                    chr = (chr - 65 + amount) % 26;
-                    output[i] = chr + 65;
-                } else if (rot13Lowercase && chr >= 97 && chr <= 122) { // Lower case
-                    chr = (chr - 97 + amount) % 26;
-                    output[i] = chr + 97;
-                }
-            }
-        }
-        return output;
-    },
-
-
-    /**
-     * @constant
-     * @default
-     */
-    ROT47_AMOUNT: 47,
-
-    /**
-     * ROT47 operation.
-     *
-     * @author Matt C [matt@artemisbot.uk]
-     * @param {byteArray} input
-     * @param {Object[]} args
-     * @returns {byteArray}
-     */
-    runRot47: function(input, args) {
-        let amount = args[0],
-            output = input,
-            chr;
-
-        if (amount) {
-            if (amount < 0) {
-                amount = 94 - (Math.abs(amount) % 94);
-            }
-
-            for (let i = 0; i < input.length; i++) {
-                chr = input[i];
-                if (chr >= 33 && chr <= 126) {
-                    chr = (chr - 33 + amount) % 94;
-                    output[i] = chr + 33;
-                }
-            }
-        }
-        return output;
-    },
-
-
-    /**
-     * Rotate right bitwise op.
-     *
-     * @private
-     * @param {byte} b
-     * @returns {byte}
-     */
-    _rotr: function(b) {
-        const bit = (b & 1) << 7;
-        return (b >> 1) | bit;
-    },
-
-
-    /**
-     * Rotate left bitwise op.
-     *
-     * @private
-     * @param {byte} b
-     * @returns {byte}
-     */
-    _rotl: function(b) {
-        const bit = (b >> 7) & 1;
-        return ((b << 1) | bit) & 0xFF;
-    },
-
-
-    /**
-     * Rotates a byte array to the right by a specific amount as a whole, so that bits are wrapped
-     * from the end of the array to the beginning.
-     *
-     * @private
-     * @param {byteArray} data
-     * @param {number} amount
-     * @returns {byteArray}
-     */
-    _rotrCarry: function(data, amount) {
-        let carryBits = 0,
-            newByte,
-            result = [];
-
-        amount = amount % 8;
-        for (let i = 0; i < data.length; i++) {
-            const oldByte = data[i] >>> 0;
-            newByte = (oldByte >> amount) | carryBits;
-            carryBits = (oldByte & (Math.pow(2, amount)-1)) << (8-amount);
-            result.push(newByte);
-        }
-        result[0] |= carryBits;
-        return result;
-    },
-
-
-    /**
-     * Rotates a byte array to the left by a specific amount as a whole, so that bits are wrapped
-     * from the beginning of the array to the end.
-     *
-     * @private
-     * @param {byteArray} data
-     * @param {number} amount
-     * @returns {byteArray}
-     */
-    _rotlCarry: function(data, amount) {
-        let carryBits = 0,
-            newByte,
-            result = [];
-
-        amount = amount % 8;
-        for (let i = data.length-1; i >= 0; i--) {
-            const oldByte = data[i];
-            newByte = ((oldByte << amount) | carryBits) & 0xFF;
-            carryBits = (oldByte >> (8-amount)) & (Math.pow(2, amount)-1);
-            result[i] = (newByte);
-        }
-        result[data.length-1] = result[data.length-1] | carryBits;
-        return result;
-    },
-
-};
-
-export default Rotate;
diff --git a/test/index.mjs b/test/index.mjs
index d1390270..dd592f6f 100644
--- a/test/index.mjs
+++ b/test/index.mjs
@@ -45,6 +45,7 @@ import "./tests/operations/Base64";
 // import "./tests/operations/NetBIOS.js";
 // import "./tests/operations/OTP.js";
 // import "./tests/operations/Regex.js";
+import "./tests/operations/Rotate.mjs";
 // import "./tests/operations/StrUtils.js";
 // import "./tests/operations/SeqUtils.js";
 import "./tests/operations/SetUnion";
diff --git a/test/tests/operations/Rotate.mjs b/test/tests/operations/Rotate.mjs
new file mode 100644
index 00000000..d7ba9af1
--- /dev/null
+++ b/test/tests/operations/Rotate.mjs
@@ -0,0 +1,215 @@
+/**
+ * Rotate tests.
+ *
+ * @author Matt C [matt@artemisbot.uk]
+ *
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ */
+import TestRegister from "../../TestRegister";
+
+
+TestRegister.addTests([
+    {
+        name: "Rotate left: nothing",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: ["Space"]
+            },
+            {
+                op: "Rotate left",
+                args: [1, false],
+            },
+            {
+                op: "To Hex",
+                args: ["Space"]
+            }
+        ],
+    },
+    {
+        name: "Rotate left: normal",
+        input: "61 62 63 31 32 33",
+        expectedOutput: "c2 c4 c6 62 64 66",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: ["Space"]
+            },
+            {
+                op: "Rotate left",
+                args: [1, false],
+            },
+            {
+                op: "To Hex",
+                args: ["Space"]
+            }
+        ],
+    },
+    {
+        name: "Rotate left: carry",
+        input: "61 62 63 31 32 33",
+        expectedOutput: "85 89 8c c4 c8 cd",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: ["Space"]
+            },
+            {
+                op: "Rotate left",
+                args: [2, true],
+            },
+            {
+                op: "To Hex",
+                args: ["Space"]
+            }
+        ],
+    },
+    {
+        name: "Rotate right: nothing",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: ["Space"]
+            },
+            {
+                op: "Rotate right",
+                args: [1, false],
+            },
+            {
+                op: "To Hex",
+                args: ["Space"]
+            }
+        ],
+    },
+    {
+        name: "Rotate right: normal",
+        input: "61 62 63 31 32 33",
+        expectedOutput: "b0 31 b1 98 19 99",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: ["Space"]
+            },
+            {
+                op: "Rotate right",
+                args: [1, false],
+            },
+            {
+                op: "To Hex",
+                args: ["Space"]
+            }
+        ],
+    },
+    {
+        name: "Rotate right: carry",
+        input: "61 62 63 31 32 33",
+        expectedOutput: "d8 58 98 cc 4c 8c",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: ["Space"]
+            },
+            {
+                op: "Rotate right",
+                args: [2, true],
+            },
+            {
+                op: "To Hex",
+                args: ["Space"]
+            }
+        ],
+    },
+    {
+        name: "ROT13: nothing",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [true, true, 13]
+            },
+        ],
+    },
+    {
+        name: "ROT13: normal",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        expectedOutput: "Gur Dhvpx Oebja Sbk Whzcrq Bire Gur Ynml Qbt.",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [true, true, 13]
+            },
+        ],
+    },
+    {
+        name: "ROT13: full loop",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [true, true, 26]
+            },
+        ],
+    },
+    {
+        name: "ROT13: lowercase only",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        expectedOutput: "Tur Qhvpx Bebja Fbk Jhzcrq Oire Tur Lnml Dbt.",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [true, false, 13]
+            },
+        ],
+    },
+    {
+        name: "ROT13: uppercase only",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        expectedOutput: "Ghe Duick Orown Sox Wumped Bver Ghe Yazy Qog.",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [false, true, 13]
+            },
+        ],
+    },
+    {
+        name: "ROT47: nothing",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                op: "ROT47",
+                args: [47]
+            },
+        ],
+    },
+    {
+        name: "ROT47: normal",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        expectedOutput: "%96 \"F:4< qC@H? u@I yF>A65 ~G6C %96 {2KJ s@8]",
+        recipeConfig: [
+            {
+                op: "ROT47",
+                args: [47]
+            },
+        ],
+    },
+    {
+        name: "ROT47: full loop",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        recipeConfig: [
+            {
+                op: "ROT47",
+                args: [94]
+            },
+        ],
+    },
+]);