Hi Carrick, Can you justify your reasoning?
The challenge I have with the work on IoT in the IETF that the preferences for pretty much everything changes on a regular basis. I don't see a problem that requires a change. In fact, I have just posted a mail to the UTA list that gives an overview of the implementation status of embedded TLS stacks and PSK-based ciphersuites are widely implemented. Ciao Hannes From: TLS <tls-boun...@ietf.org> On Behalf Of Carrick Bartle Sent: Monday, September 21, 2020 5:31 AM To: Filippo Valsorda <fili...@ml.filippo.io> Cc: tls@ietf.org Subject: Re: [TLS] The future of external PSK in TLS 1.3 I'm also fine with marking psk_ke as not recommended to be consistent with the non-PFS ciphers, but there are plenty of valid use cases that justify keeping dhe_psk_ke as recommended for external PSKs. Several of these use cases are detailed in draft-ietf-tls-external-psk-guidance-00. On Sep 19, 2020, at 9:00 AM, Filippo Valsorda <fili...@ml.filippo.io<mailto:fili...@ml.filippo.io>> wrote: 2020-09-19 13:48 GMT+02:00 Peter Gutmann <pgut...@cs.auckland.ac.nz<mailto:pgut...@cs.auckland.ac.nz>>: John Mattsson <john.mattsson=40ericsson....@dmarc.ietf.org<mailto:40ericsson....@dmarc.ietf.org>> writes: >Looking at the IANA TLS registry, I am surprised to see that psk_dhe_ke and >especially psk_ke are both marked as RECOMMENDED. If used in the initial >handshake, both modes have severe privacy problems, PSK is used a fair bit in SCADA. There are no privacy problems there. So just because there's a concern for one specific environment doesn't mean it should be banned for any use. In particular, I think if a specific industry has a particular concern, they should profile it for use in that industry but not require that everyone else change their behaviour. Indeed, if the SCADA industry has a particular need, they should profile TLS for use in that industry, and not require we change the recommendation for the open Internet. Setting Recommended to N is not "banning" anything, it's saying it "has not been through the IETF consensus process, has limited applicability, or is intended only for specific use cases". SCADA sounds like a pretty specific use case. I don't have a strong opinion on psk_dhe_ke, but I see no reason psk_ke wouldn't be marked N like all suites lacking PFS. _______________________________________________ TLS mailing list TLS@ietf.org<mailto:TLS@ietf.org> https://www.ietf.org/mailman/listinfo/tls 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.
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