[121233] in cryptography@c2.net mail archive
Re: Cruising the stacks and finding stuff
daemon@ATHENA.MIT.EDU (Victor Duchovni)
Mon Apr 21 13:50:14 2008
Date: Mon, 21 Apr 2008 13:43:55 -0400
From: Victor Duchovni <Victor.Duchovni@morganstanley.com>
To: Cryptography <cryptography@metzdowd.com>
Mail-Followup-To: Cryptography <cryptography@metzdowd.com>
In-Reply-To: <480960C4.20207@sound-by-design.com>
On Fri, Apr 18, 2008 at 08:02:28PM -0700, Allen wrote:
> Granted A5/1 is known to be very weak, but how much weaker than
> AES-128? Ten orders of magnitude? I haven't a clue ...
This is usually the point where I stop reading. Of course 10 orders of
magnitude is ~33 bits, so unless the A5 attacks crack a cipher with ~95
bits security, the estimate is grossly wrong.
If (generously) A5 is 64 bits of work, AES is ~20 orders of magnitude
stronger.
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