IETF logoThe -01 version of draft-jones-jose-key-managed-json-web-signature tightened the semantics by prohibiting use of “dir” as the “alg” header parameter value so a second equivalent representation for content integrity-protected with a MAC with no key management isn’t introduced. (A normal JWS will do just fine in this case.) Thanks to Jim Schaad for pointing this out. This version also adds acknowledgements and references the now-final JOSE RFCs.

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