The Vernam Cipher

[Magnum]

The XOR part seems pretty straight forward, but generating a truly random amount of text would seem to be the hard part in making the key.

http://cryptomuseum.com/crypto/vernam.htm

[KeepingRealBusy]

Magnum,

The German Enigma was  essentially a vernam machine, but instead of the tape, it used a set of disks which could be re-arranged and set to different starting positions,and these elements implemented a pseudo random number generator to replace the tape.

The random one time pad was the real problem, creation, distribution, destruction, etc.

Dave.