[12501] in cryptography@c2.net mail archive
Re: Columbia crypto box
daemon@ATHENA.MIT.EDU (Steven M. Bellovin)
Mon Feb 10 20:09:18 2003
X-Original-To: cryptography@wasabisystems.com
X-Original-To: cryptography@wasabisystems.com
From: "Steven M. Bellovin" <smb@research.att.com>
To: Bill Frantz <frantz@pwpconsult.com>
Cc: cryptography@wasabisystems.com
Date: Mon, 10 Feb 2003 19:29:27 -0500
In message <v03110705ba6dec92ddb0@[192.168.1.5]>, Bill Frantz writes:
> * Fast key setup (Forget tossing the 256 bytes of key stream.
> The designers weren't crypto engineers. Personally, I'd toss the
> first 1024.)
I reran my script assuming that the first 1024 bytes of each packet
were discarded. It triples the cost of encryption, compared to
discarding nothing.
There may be a cryptographically sound reason to discard that much, but
it's not without cost.
--Steve Bellovin, http://www.research.att.com/~smb (me)
http://www.wilyhacker.com (2nd edition of "Firewalls" book)
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