On Thu, Jul 25, 2019 at 9:04 AM Thomas Fossati <thomas.foss...@arm.com> wrote:
> Thanks for presenting this work. I really like this and I think > > it'd be really useful for the use cases we have (IoT, M2M). > > > > One comment: from a quick skimming of the draft, I'm not sure I > > understand what the stated expectations on the transport layer are? > > > > Since it's cTLS and not cDTLS I'd have thought it's the same as TLS > > (in-order & reliable) but then I got confused reading section 3.2 [1]: > > > > "The CTLS Record Layer assumes that records are externally framed > > (i.e., that the length is already known because it is carried in > > a UDP datagram or the like)" > > > > On Jabber Ben suggested that one could put CoAP between UDP and cTLS to > > get in-order & reliable delivery with a datagram transport, but then I'm > > not sure what the advantage would be since we'd be trading 2 bytes of > > TLSPlaintext.length with 4 bytes (minimum) of CoAP header? > The idea here was that you might be in a situation where you had external framing anyway. I'm sure we can figure out some way to make that optional. -Ekr > > From the Jabber discussion, my current understanding is that there are 2 > > assumptions: a) the transport is in-order & reliable, and 2) there is > > one TLS record per transport layer packet. > > > > Is that the correct interpretation? If it is, is it not too restrictive > > a requirement? > > > > Cheers, thanks > > > > [1] https://tools.ietf.org/html/draft-rescorla-tls-ctls-02#section-3.2 > > > > > IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > _______________________________________________ > TLS mailing list > TLS@ietf.org > https://www.ietf.org/mailman/listinfo/tls >
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