phc-discussions - Re: Dumb idea of the day: Public key crypto based on random permutations

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Date: Sat, 15 Aug 2015 06:31:06 -0700
From: Bill Cox <waywardgeek@...il.com>
To: "discussions@...sword-hashing.net" <discussions@...sword-hashing.net>
Subject: Re: Dumb idea of the day: Public key crypto based on random permutations

Minor code fix: use generator g = Finv(1) rather than g = 0.  This way, we
know that all possible values are reachable in the internal "tmp" variable
of the F function, which is F(a) + F(b).  g generates the whole group, and
m*g does not repeat until m == 2^bits.

Again, there's something very off here... something super dumb.  I bet this
is trivially proved insecure.

Bill

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