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Subject: Re: [Re: cycle in hash chain ?]
From: Ben Laurie (benalgroup.co.uk)
Date: Fri Apr 28 2000 - 11:56:05 CDT


"R.M." wrote:
>
> It seems clear by intuition that any function whose input is from an infinite
> field and whose result is from a finite field must eventually generate
> duplicate values.

You don't need intuition for that, its obvious. However, the interesting
question is whether it cycles. I can trivially prove it need not,
however, the really interesting question is whether a one way function
should generally fail to cycle. Intuition says to me: "yes".

> In a process like
> > S1 = E_k(S0 ^ n),
> for any given SO it has to cycle when n >= SO.

Proof?

Cheers,

Ben.

--
http://www.apache-ssl.org/ben.html