RE: Just how does it know?

Nelson Minar (nelson@media.mit.edu)
Thu, 1 May 1997 11:13:01 -0400


>This also brings up a point as to how useful it would be to break DES
>encryption. If I encrypt a message with a 56 bit key, and you have no
>idea what the first 24 characters are, you really have no way of telling
>when you manage to pick the right key.

Most practical encryption scenarios involve some amount of known
plaintext. Packet headers, file formats, etc. It's very difficult to
get a message to have perfect entropy. So the challenge is realistic.