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Last Call Review of draft-ietf-webpush-vapid-03

Request Review of draft-ietf-webpush-vapid
Requested revision No specific revision (document currently at 04)
Type Last Call Review
Team Ops Directorate (opsdir)
Deadline 2017-07-03
Requested 2017-06-19
Authors Martin Thomson , Peter Beverloo
I-D last updated 2017-07-03
Completed reviews Opsdir Last Call review of -03 by Stefan Winter (diff)
Genart Last Call review of -03 by Joel M. Halpern (diff)
Secdir Last Call review of -03 by Robert Sparks (diff)
Assignment Reviewer Stefan Winter
State Completed
Request Last Call review on draft-ietf-webpush-vapid by Ops Directorate Assigned
Reviewed revision 03 (document currently at 04)
Result Has issues
Completed 2017-07-03
Cryptographic agility is ensured by requiring an all-new protocol in case a
different algorithm is used, or any other protocol property is changed (the
newly defined auth scheme "vapid" is hard-wired to ECDSA NIST P-256, and there
is no version field in the JWT token). Considering that the JWT header and JWK
fields describe their signing method, making it cryptographically agile,
pinning the algorithm appears to be a strange choice (see the example in 2.4).

The last paragraph of Security Considerations remains a mystery to me. What is
a "gradual migration"? With no key rollover, any change of key simply breaks
all clients with using that key. The last sentence implies that such a hard
failure is acceptable. That's a rather simplistic protocol design.

The example in 2.4 does not appear to be correct. I cannot decode "t":

> base64 --decode
{"typ":"JWT","alg":"ES256"}base64: ung├╝ltige Eingabe