Implementation of an enigma machine
$ npm install enigma
var enigmajs = require('enigma');
var rotorI = new enigmajs.Rotor('EKMFLGDQVZNTOWYHXUSPAIBRCJ', 'Q');
var rotorIII = new enigmajs.Rotor('BDFHJLCPRTXVZNYEIWGAKMUSQO', 'V');
var rotorIV = new enigmajs.Rotor('ESOVPZJAYQUIRHXLNFTGKDCMWB', 'J');
var reflector = new enigmajs.Reflector('YRUHQSLDPXNGOKMIEBFZCWVJAT');
var plugboard = new enigmajs.Plugboard( 'AD CN ET FL GI JV KZ PU QY WX' );
var entryWheel = new enigmajs.EntryWheel('ABCDEFGHIJKLMNOPQRSTUVWXYZ');
var enigma = new enigmajs.Enigma([rotorI, rotorIV, rotorIII], reflector, plugboard, entryWheel);
console.log( enigma.string( 'EXAMPLEMESSAGE' ) );
Prints out RRHIUUFUVJLJYY
You should also have a look at this test which demonstrates a more realistic procedure to cipher/decipher a message.