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- Newsgroups: sci.crypt
- Path: sparky!uunet!wupost!csus.edu!netcom.com!rlglende
- From: rlglende@netcom.com (Robert Lewis Glendenning)
- Subject: Compression and Randomization == Encryption
- Message-ID: <1993Jan7.045921.18680@netcom.com>
- Organization: Netcom Online Communications Services (408-241-9760 login: guest)
- Date: Thu, 7 Jan 1993 04:59:21 GMT
- Lines: 22
-
- Yes, compression software provides clues just the same as standard headers.
- However, compression also reduces redundancy.
-
- I believe that Shannon's Information Theory implies that a signal with no
- redundancy is uncrackable. So, if you merely randomize the order of the
- compressed bytes, the difficulty of cracking it should be an exponential
- order of the length of the message. If you want to make sure, and for short
- messages, add some random stuff. Then the cracker has the problem of separating
- the signal from the noise, ordering it, and then (the easy part) decompressing
- it.
-
- I keep wondering why this appraoch isn't intellectually respectable. At minor
- computational cost and selectable increase in comm costs, it appears that
- you can have a vast increase in security, including resistance to cracking
- traffic beginning with common headers, etc.
-
- I guess I am a novice also, because I don't appear to understand either.
-
- Lew
- --
- Lew Glendenning rlglende@netcom.com
- "Perspective is worth 80 IQ points." Nils Bohr (or somebody like that).
-