diff --git a/src/core/operations/AffineCipherDecode.mjs b/src/core/operations/AffineCipherDecode.mjs
deleted file mode 100644
index 869f231a..00000000
--- a/src/core/operations/AffineCipherDecode.mjs
+++ /dev/null
@@ -1,106 +0,0 @@
-/**
- * @author Matt C [matt@artemisbot.uk]
- * @copyright Crown Copyright 2018
- * @license Apache-2.0
- */
-
-import Operation from "../Operation.mjs";
-import Utils from "../Utils.mjs";
-import OperationError from "../errors/OperationError.mjs";
-
-/**
- * Affine Cipher Decode operation
- */
-class AffineCipherDecode extends Operation {
-
-    /**
-     * AffineCipherDecode constructor
-     */
-    constructor() {
-        super();
-
-        this.name = "Affine Cipher Decode";
-        this.module = "Ciphers";
-        this.description = "The Affine cipher is a type of monoalphabetic substitution cipher. To decrypt, each letter in an alphabet is mapped to its numeric equivalent, decrypted by a mathematical function, and converted back to a letter.";
-        this.infoURL = "https://wikipedia.org/wiki/Affine_cipher";
-        this.inputType = "string";
-        this.outputType = "string";
-        this.args = [
-            {
-                "name": "a",
-                "type": "number",
-                "value": 1
-            },
-            {
-                "name": "b",
-                "type": "number",
-                "value": 0
-            }
-        ];
-    }
-
-    /**
-     * @param {string} input
-     * @param {Object[]} args
-     * @returns {string}
-     *
-     * @throws {OperationError} if a or b values are invalid
-     */
-    run(input, args) {
-        const alphabet = "abcdefghijklmnopqrstuvwxyz",
-            [a, b] = args,
-            aModInv = Utils.modInv(a, 26); // Calculates modular inverse of a
-        let output = "";
-
-        if (!/^\+?(0|[1-9]\d*)$/.test(a) || !/^\+?(0|[1-9]\d*)$/.test(b)) {
-            throw new OperationError("The values of a and b can only be integers.");
-        }
-
-        if (Utils.gcd(a, 26) !== 1) {
-            throw new OperationError("The value of `a` must be coprime to 26.");
-        }
-
-        for (let i = 0; i < input.length; i++) {
-            if (alphabet.indexOf(input[i]) >= 0) {
-                // Uses the affine decode function (y-b * A') % m = x (where m is length of the alphabet and A' is modular inverse)
-                output += alphabet[Utils.mod((alphabet.indexOf(input[i]) - b) * aModInv, 26)];
-            } else if (alphabet.indexOf(input[i].toLowerCase()) >= 0) {
-                // Same as above, accounting for uppercase
-                output += alphabet[Utils.mod((alphabet.indexOf(input[i].toLowerCase()) - b) * aModInv, 26)].toUpperCase();
-            } else {
-                // Non-alphabetic characters
-                output += input[i];
-            }
-        }
-        return output;
-    }
-
-    /**
-     * Highlight Affine Cipher Decode
-     *
-     * @param {Object[]} pos
-     * @param {number} pos[].start
-     * @param {number} pos[].end
-     * @param {Object[]} args
-     * @returns {Object[]} pos
-     */
-    highlight(pos, args) {
-        return pos;
-    }
-
-    /**
-     * Highlight Affine Cipher Decode 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 AffineCipherDecode;