-----BEGIN PGP SIGNED MESSAGE----- If you simply do not want to be a final hop, it is trivial to distinguish final hops from intermediate hops in the chain. With cypherpunk remailers you can scan for the remailer headers. With Mixmaster there is a completely different format to the encrypted header (inside the encryption) for final hops as opposed to intermediate hops. I think one solution to this problem is to encourage (require) the use of pseudonym servers. Having a server like alpha as the entity on the from line has several advantages. 1) Less Spam since it takes some effort to set up the nym and it will be taken away as soon as the spam starts. 2) The operator can take firm action. When people complain they want you to punish the abuser. Typically they want you to pull the offenders account. With a remailer there is no account to pull, but with a nym server it is easy to kill the account, making the complainer happy. 3) The nym server could have a policy of only accepting messages encrypted to it, and logging the address the message came from. If confronted, the nym server could point to the last remailer in the chain. But that remailer could not have known the contents of the message since it was encrypted to the nym server. If all nym servers were standardized to run from the same account name (nymserve for example) the remailers could be configured to only deliver final hops to addresses with that username. -Lance
At 12:59 PM 10/19/95 -0400, Thomas Grant Edwards wrote:
This would require the remailer to examine entropy of messages passing through. Anything not random enough gets tossed.
A simple entropy measuring algorithm:
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