Added JavaScript implementationg

JavaScript/XOREncryption.js

@@ -0,0 +1,17 @@
+function encryptDecrypt(input) {
+	var key = ['K', 'C', 'Q']; //Can be any chars, and any size array
+	var output = [];
+	
+	for (var i = 0; i < input.length; i++) {
+		var charCode = input.charCodeAt(i) ^ key[i % key.length].charCodeAt(0);
+		output.push(String.fromCharCode(charCode));
+	}
+	return output.join("");
+}
+
+
+var encrypted = encryptDecrypt("kylewbanks.com");
+console.log("Encrypted:"+encrypted);
+
+var decrypted = encryptDecrypt(encrypted);
+console.log("Decrypted:"+decrypted);