Re: [tcpm] tcp-auth-opt issue: support for NATs
Eric Rescorla <ekr@networkresonance.com> Thu, 07 August 2008 01:08 UTC
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Date: Wed, 06 Aug 2008 18:18:12 -0700
From: Eric Rescorla <ekr@networkresonance.com>
To: Adam Langley <agl@imperialviolet.org>
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Cc: tcpm@ietf.org, Joe Touch <touch@isi.edu>
Subject: Re: [tcpm] tcp-auth-opt issue: support for NATs
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At Wed, 6 Aug 2008 17:42:19 -0700, Adam Langley wrote: > > On Tue, Aug 5, 2008 at 7:02 PM, Eric Rescorla <ekr@networkresonance.com> wrote: > > Isn't the whole point of the key-ids to avoid requiring this? > > Well, keyids would be required too. Here's how I see it working. > > Define a synchronisation range, R, say 1 minute. We require that the > maximum skew between two clocks is R. > > Define a key rotation timespan, T, say 1 minute. Let N be the maximum > number of keys that exist in a timespan of 2R. In our example, this is > two. > > Define a function K(master, t) that maps a timestamp to a key derived > from a master key and a keyid in [0, N). For example, F(master, t) = > SHA1(master + uint32be (t/T)) with keyid (t/T) `mod` N. > > At any time, a client transmits with key and keyid from F(master, > currentTime). At any time, the server accepts SYN signed with any > keyid and key in a span of 2R centered around the current time. > > So one can only connect if one's clock skew is acceptable and one > knows the master key. > > The keys for the resulting connection would be connection specific, > probably hashing in the SEQ/ACK numbers, other stuff etc. I'm sorry, I must be missing something. what problem are you trying to solve? -Ekr _______________________________________________ tcpm mailing list tcpm@ietf.org https://www.ietf.org/mailman/listinfo/tcpm
- [tcpm] tcp-auth-opt issue: support for NATs Joe Touch
- Re: [tcpm] tcp-auth-opt issue: support for NATs Adam Langley
- Re: [tcpm] tcp-auth-opt issue: support for NATs Joe Touch
- Re: [tcpm] tcp-auth-opt issue: support for NATs Adam Langley
- Re: [tcpm] tcp-auth-opt issue: support for NATs Joe Touch
- Re: [tcpm] tcp-auth-opt issue: support for NATs Adam Langley
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Adam Langley
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Adam Langley
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Adam Langley
- Re: [tcpm] tcp-auth-opt issue: support for NATs Joe Touch
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Joe Touch
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Joe Touch
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Joe Touch
- Re: [tcpm] tcp-auth-opt issue: support for NATs Adam Langley
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Anantha Ramaiah (ananth)
- Re: [tcpm] tcp-auth-opt issue: support for NATs Dan Wing
- Re: [tcpm] tcp-auth-opt issue: support for NATs Dan Wing
- Re: [tcpm] tcp-auth-opt issue: support for NATs Ron Bonica
- Re: [tcpm] tcp-auth-opt issue: support for NATs Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: support for NATs Dan Wing
- Re: [tcpm] tcp-auth-opt issue: support for NATs Ted Faber
- Re: [tcpm] tcp-auth-opt issue: support for NATs Dan Wing
- Re: [tcpm] tcp-auth-opt issue: support for NATs Joe Touch