node-autokey
v1.0.6
Published
Javascript implementation of the Autokey cipher
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Autokey
A Javascript implementation of the simple Autokey cipher. Autokey has some useful characteristics: the output is the same length as the input and looks like the input was merely jumbled as it uses the same alphabet as the input:
- Input:
all our words from loose using have lost their edge.
- Output:
kbu cjd hprjy qmud ilujd xpxkq xxsw hvng zgksj nqwa.
This is similar to and based on the stream cipher implementation at https://github.com/hex7c0/autokey but restricts the input and output to a given alphabet. This means you can let spaces, punctuation, and other characters go through the algorithm with no change.
How it works
To install:
npm install node-autokey
Example script
var Autokey = require('node-autokey');
var assert = require('assert')
var alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
// The key does not have to be chosen from the alphabet.
var akey = new Autokey("My Key Is This@)(#*$", alphabet);
var input = "Something very important!";
var ciphertext = akey.encode(input);
console.log(ciphertext);
var recoveredtext = akey.decode(ciphertext);
assert.equal(recoveredtext, input);
Caveat
Autokey is a very old cipher with known vulnerabilities and is not as secure as modern encryption systems. You should consider this algorithm as a slightly better alternative to ROT13 or base64 for obfuscating text.