I'm a bit behind on my e-mail again... paul@fatmans.demon.co.uk writes:
Well, they can compile the list of addresses off of USENET postings and such and then compute the hashes of the compiled names and identify those that are on the anon acceptance list. Not that it completely invalidates the idea, but certainly it is a problem.
If a time delay isn`t a problem a remailer could operate on the list with a MAC, if someone wants to find out if a name is on the list they submit a request to the remailer operator who daily executes a batch job using a (memorised) key to verify the hashes against one another.
Another idea I just had.
Alice`s remailer recieves a message for Bob.
The remailer blinds the message with the prime p, sends bob the blinded message, a product pq and a random number, x, all the remailer keeps is q and x. Bob, to retrieve the message as cleartext sends the remailer x and a request in return the remailer sends bob q, bob divides pq by q to get p and unblinds the message... Any comments?
This is cute, but if Bob has enough clue to do this, then Bob can probably handle anonymous e-mail whose content he doesn't like... --- Dr.Dimitri Vulis KOTM Brighton Beach Boardwalk BBS, Forest Hills, N.Y.: +1-718-261-2013, 14.4Kbps