mta-hashcash March 2022

mta-hashcash@lists.lysator.liu.se

1 participants
4 discussions

Updated draft. MTA identification?
by nisse＠lysator.liu.se 24 Jun '26

24 Jun '26

I've updated the draft now (see http://www.lysator.liu.se/~nisse/misc/draft-nisse-hash-cash.txt), trying to address the issues raised by Simon and during the meeting. It now uses per-MTA keys. Then an important question is how an MTA is identified. Ideally, all border-MTA-s belogning to the same administrative domain should have the same identity (except perhaps secondaries). It's not clear if a mail server that accepts mail for multiple domains should have a single id, or one id per domain. I tried to write this down in section 4. Do we need new terminology for the things we identify? It's slightly confusing to say "MTA" when we are talking about not a single mail server, but a fuzzy group of them? Other notable changes: Authentication means signing a challenge string, of the same form as the hash cash challenges. Hash cash challenges now use hmac-sha1, with the string to be search for in the key argument, in order to make the construction somewhat more cryptographically sound. Most of the text on name-key semantics is deleted. /Niels

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None
by None 08 Mar '22

08 Mar '22

each single zombie machine nowadays to avoid that the operator notices what's happening. Generally, I would like to avoid tying keys to IP addresses, but it might be what's most effective after all. We might touch into SPF and their likes here? Don't know really. | > When speaking of client coming back, we mustn't forget to demand that | > the client connects to the very same MTA the second time. | | What does "same" mean? Same A-record (IP address), or the same | MX-record? Same machine, or all MTA:s serving the same domain have to share their database with outstanding challenges and this with very short replication times. A client might just come back within a second or so.

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mta-hashcash March 2022