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Task/Vigen-re-cipher/Nim/vigen-re-cipher.nim

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+import strutils
+
+proc isAlpha(c): bool = c in 'a'..'z' or c in 'A'..'Z'
+
+proc encrypt(msg, key): string =
+  result = ""
+  var pos = 0
+  for c in msg:
+    if isAlpha c:
+      result.add chr(((ord(key[pos]) + ord(toUpper c)) mod 26) + ord('A'))
+      pos = (pos + 1) mod key.len
+
+proc decrypt(msg, key): string =
+  result = ""
+  var pos = 0
+  for c in msg:
+    result.add chr(((26 + ord(c) - ord(key[pos])) mod 26) + ord('A'))
+    pos = (pos + 1) mod key.len
+
+const text = "Beware the Jabberwock, my son! The jaws that bite, the claws that catch!"
+const key = "VIGENERECIPHER"
+
+let encr = encrypt(text, key)
+let decr = decrypt(encr, key)
+
+echo text
+echo encr
+echo decr

Task/Vigen-re-cipher/Sidef/vigen-re-cipher.sidef

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+func s2v(s) { s.uc.scan(/[A-Z]/)»ord»() »-» 65 };
+func v2s(v) { (v »%» 26 »+» 65)»chr»().join };
+
+func blacken (red, key) { v2s(s2v(red) »+« s2v(key)) };
+func redden  (blk, key) { v2s(s2v(blk) »-« s2v(key)) };
+
+var red = "Beware the Jabberwock, my son! The jaws that bite, the claws that catch!";
+var key = "Vigenere Cipher!!!";
+
+say red;
+say (var black = blacken(red, key));
+say redden(black, key);

Task/Vigen-re-cipher/TypeScript/vigen-re-cipher.type

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+class Vigenere {
+
+    key: string
+
+    /** Create new cipher based on key */
+    constructor(key: string) {
+        this.key = Vigenere.formatText(key)
+    }
+
+    /** Enrypt a given text using key */
+    encrypt(plainText: string): string {
+        return Array.prototype.map.call(Vigenere.formatText(plainText), (letter: string, index: number): string => {
+            return String.fromCharCode((letter.charCodeAt(0) + this.key.charCodeAt(index % this.key.length) - 130) % 26 + 65)
+        }).join('')
+    }
+
+    /** Decrypt ciphertext based on key */
+    decrypt(cipherText: string): string {
+        return Array.prototype.map.call(Vigenere.formatText(cipherText), (letter: string, index: number): string => {
+            return String.fromCharCode((letter.charCodeAt(0) - this.key.charCodeAt(index % this.key.length) + 26) % 26 + 65)
+        }).join('')
+    }
+
+    /** Converts to uppercase and removes non characters */
+    private static formatText(text: string): string {
+        return text.toUpperCase().replace(/[^A-Z]/g, "")
+    }
+
+}
+
+/** Example usage */
+(() => {
+    let original: string = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book."
+
+    console.log(`Original: ${original}`)
+
+    let vig: Vigenere = new Vigenere("vigenere")
+
+    let encoded: string = vig.encrypt(original)
+
+    console.log(`After encryption: ${encoded}`)
+
+    let back: string = vig.decrypt(encoded)
+
+    console.log(`After decryption: ${back}`)
+
+})()