[Cryptography] Hashes into Ciphers (was Re: FIPS, NIST and ITAR questions)

Perry E. Metzger perry at piermont.com
Wed Sep 4 10:37:12 EDT 2013

As a pure aside...

On Tue, 3 Sep 2013 15:16:14 -0400 Faré <fahree at gmail.com> wrote:
> Can't you trivially transform a hash into a PRNG, a PRNG into a
> cypher, and vice versa?

Phil Karn described a construction for turning any hash function into
the core of a Feistel cipher in 1991. So far as I can tell, such
ciphers are actually quite secure, though impractically slow.

Pointers to his original sci.crypt posting would be appreciated, I
wasn't able to find it with a quick search.

Perry E. Metzger		perry at piermont.com

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