If you don’t care about FIPS-140, just delete this message, and avoid the 
temptation to argue how bad it is.

NIST SP 800-56C (Recommendation for Key-Derivation Methods in Key-Establishment 
Schemes) is currently a draft in review. The document is at 
https://csrc.nist.gov/publications/detail/sp/800-56c/rev-2/draft  Email 
comments can be sent to 800-56c_comme...@nist.gov with a deadline of May 15.  
That is not a lot of time.  The NIST crypto group is currently unlikely to 
include HKDF, which means that TLS 1.3 would not be part of FIPS. The CMVP 
folks at NIST understand this, and agree that this would be bad; they are 
looking at adding it, perhaps via an Implementation Guidance update.

If you have a view of HKDF (and perhaps TLS 1.3), I strongly encourage you to 
comment at the above address.  Please do not comment here. I know that many 
members of industry and academia have been involved with TLS 1.3, and performed 
security analysis of it. If you are one of those people, *please* send email 
and ask the NIST Crypto Team to reconsider.

Thank you.
        /r$



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