marius wrote: > > "But there was an utterly trivial fix that DES users could employ if > they were worried > about security: they could simply encrypt each message twice, turning > 56-bit DES into 112-bit DES, and squaring the number of key sequences > that > a code breaker would have to try. Messages could even be encrypted > thrice; > and, indeed, many financial institutions at the time were already using > "Triple DES." " > > Not quite true. Encrypting each message twice would not increase the > "effective" key size to 112 bits. > There is an attack named "meet in the middle" which will make the > effective key size to be just 63 bits.
?? 56 bits "plus a little", surely. Cheers, Ben. -- http://www.apache-ssl.org/ben.html http://www.thebunker.net/ "There is no limit to what a man can do or how far he can go if he doesn't mind who gets the credit." - Robert Woodruff --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]
