[47088] in Cypherpunks
Re: Novel use of Usenet and remailers to mailbomb from luzskru@cpcnet.com
daemon@ATHENA.MIT.EDU (John Lull)
Fri Jan 12 17:38:32 1996
From: lull@acm.org (John Lull)
To: abostick@netcom.com (Alan Bostick)
Cc: cypherpunks@toad.com
Date: Fri, 12 Jan 1996 22:25:53 GMT
In-Reply-To: <Q6q9w8m9LYlM085yn@netcom.com>
On Fri, 12 Jan 1996 10:55:12 -0800, you wrote:
> Cypherpunks: is there any way to respond to, or prevent, this sort of
> attack short of actually shutting down the remailer?
Yes, very simply.
The remailer could calculate a hash for the body of each encrypted
message received (the same portion which will be decrypted by PGP),
tabulate the last few thousand hashes, and simply discard any messages
with a duplicate hash. The target of the attack would receive only
the first copy of the message.
