Re: Novel use of Usenet and remailers to mailbomb from luzskru@cpcnet.com

[lull@acm.org (John Lull)]

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.