I should clarify that my objection is to a working group IF a JOSE->CBOR mapping is trivial enough, and if it's not trivial due to CBOR having a different data model from JOSE, well, then there's Phillip's I-told-you- so. Also, COSE is predicated on constrained devices ("class 1"), and some thought convinces me that it is true that [at least a profile of] CBOR is easier to implement than JSON, but mostly that's a function of a) being able to use base-2 number representations on the wire, and b) not having to escape/unescape strings. Decimal<->IEEE754 conversions are easily the trickiest part of any decent JSON parser/encoder, so I'm quire prepared to believe that CBOR is easier to implement on class 1 constrained devices. Now, looking again at the WG proposal, there are deliverables that go beyond merely mapping JOSE onto CBOR, so perhaps there is enough work for a WG. Therefore I retract my opposition. Nico --