On Thu, Oct 26, 2017 at 04:37:47PM -0700, Eric Rescorla wrote: > Hi folks, > > Building on our discussion in Prague I've posted two PRs for shrinking the > header size: > > https://github.com/tlswg/dtls13-spec/pull/16 > - This introduces a shortened header format that just has a truncated > sequence > number and epoch but no length so it has to be packet one per datagram > > https://github.com/tlswg/dtls13-spec/pull/20 > - This builds on top of PR#16 to reduce the long header format, removing the > version number and shortening the epoch/sequence number. >
How does the latter one interact with the stuff in "Establishing New Associations with Existing Parameters"? The initial packets are distinguishable yes, but that subsection talks about possibly doing full handshake before discarding old state, which could prove rather messy. Also, I think that due to DTLS 1.2 compatiblity, only record type 23 (and 25) can use new record format. In practicular, I think 21 and 22 can not, since existing DTLS 1.2 libraries use those without negotiation. Also, on fast transmission, loss burst of ~2000 packets doesn't take much time. Such loss burst could result, e.g., from transient routing failure. One might want to discuss how to prevent desyncs from those. -Ilari _______________________________________________ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
