[45026] in Cypherpunks
Re: Still more on the Digicash protocol
daemon@ATHENA.MIT.EDU (Andrew Loewenstern)
Fri Dec 8 22:16:30 1995
From: Andrew Loewenstern <andrew_loewenstern@il.us.swissbank.com>
Date: Fri, 8 Dec 95 17:54:47 -0600
To: "Rev. Mark Grant" <mark@unicorn.com>
Cc: David A Wagner <daw@guaymas.CS.Berkeley.EDU>, cypherpunks@toad.com
David A Wagner writes:
> >Tough!? It's trivial for an active attacker, in the stream cipher case.
> >He just xors some bits: no clever cryptanalysis needed. (Or did you mean
> >it's tough to mount an active attack? I agree: that requires significant
> >knowledge or motivation.)
Rev. Mark Grant responds:
> Exactly.. once you have an active attack set up, it's trivial, but
> setting that up is quite hard.
But setting up an active attack is probably a hell of a lot easier than
breaking 128-bit RC-4 (or even 64-bit).
andrew
