Making encoding out of an authentication cipher

[Deranged Mutant]

On 17 Jul 96 at 19:36, EVERHART at Arisia.GCE.Com wrote:

> Had an interesting thought, maybe worth passing on for commentary.
> 
> (...since "authentication" ciphers are considered "harmless" by
> those interested in spying on your info...)
> 
> Suppose you have a secure hash function H(msg) that delivers a random
[..]

There's a section in Schneier's Applied Cryptography about using hash 
algorithms for ciphers.  There are several ways of doing this, 
although some are stronger than others.

One you adapt the hash algorithm to a cipher, it's a cipher, not a 
hash algorithm, and is regulated.

Rob
 
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