[Cryptography] Hashes into Ciphers

[Ben Laurie]

On 4 September 2013 15:49, Perry E. Metzger <perry at piermont.com> wrote:

> On Wed, 4 Sep 2013 10:37:12 -0400 "Perry E. Metzger"
> <perry at piermont.com> wrote:
> > 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.
>
> Answering my own question
>
>
> https://groups.google.com/forum/#!original/sci.crypt/tTWR2qIII0s/iDvT3ptY5CEJ
>
> Note that Karn's construction need not use any particular hash
> function -- he's more or less simply describing how to use a hash
> function of any sort as the heart of a Feistel cipher.
>

His claim is that it is actually faster than DES, not impractically slow.
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