22 May
1993
22 May
'93
1:20 a.m.
peb@PROCASE.COM writes:
Compressing before encryption is vital--it makes brute force and plaintext attacks much more difficult.
Be careful doing that. It's fine if you are using a compression algorithm that is designed for use with encryption, but if you're just using compress and you make that known, then an opponent just has to look for the magic numbers and headers that compress puts in the front of every file. Instead of believing that strings like "the" will appear somewhere, the opponent now knows exactly what the encrypted document starts with. ----------------------------------------------------------------- Tom Strong N3NBB ts49+@andrew.cmu.edu