----- Forwarded message from Jacob Appelbaum ----- Date: Sun, 04 Aug 2013 01:29:45 +0000 From: Jacob Appelbaum To: tor-dev@lists.torproject.org Subject: [tor-dev] augmenting RSA identities/signatures with ECC and beyond Reply-To: tor-dev@lists.torproject.org Hi, Linus and I had an interesting discussion at IETF 87 this past week in Berlin. We're both concerned about long term Directory Authority identity keys as well consensus signing with RSA keys. We've agreed that we're interested in writing a proposal whereby we add additional identity keys for authorities. Thus, we'll have whatever security may be provided by RSA and the security that should be provided by ECC signatures. The work on ntor should directly assist us in having almost all the required crypto we'll need for such augmentation. I tend to think that every directory authority should generate an additional and new long term ECC identity key. This will require that tor-gencert is extended to understand both ECC and RSA. We'll want to add these fingerprints to src/or/config.c for each respective DA. We'll want each directory authority to sign with both RSA and ECC. We'll also want to extend the consensus format to handle publication of such signatures. Older clients should be able to parse the consensus without worry and they will check RSA signatures as always. Newer clients should check both and report a mismatch into the logs at a high level. When combined with ntor, I believe that we will have significantly improved the cryptography in Tor. It would be nice to be able to add other signature schemes - specifically for pq crypto related undertakings. In an ideal world, I'd like to be able to sign the consensus from my directory authority with RSA, ECC and some kind of djb approved, tanja tested post-quantum computer signature construct. What do you think we should consider as we draft this proposal? All the best, Jacob _______________________________________________ tor-dev mailing list tor-dev@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-dev ----- End forwarded message ----- -- Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://ativel.com http://postbiota.org AC894EC5: 38A5 5F46 A4FF 59B8 336B 47EE F46E 3489 AC89 4EC5