On Wed, Mar 25, 2020 at 3:53 AM Vittorio Bertocci <vittorio.bertocci= 40auth0....@dmarc.ietf.org> wrote:
> *>4 p1: Saying asymmetric signatures are RECOMMENDED presupposes that key > distribution is the implementer’s primary concern. MAC-based > implementations shouldn’t be seen as some weird edge case scenario (though > it’d be worth including some Security Considerations text calling out the > key distribution challenges when dealing with loosely coupled ASes and > RSes).* > > In the spirit of achieving the simplest, most actionable core interop > profile, with as little left as exercise to the reader as possible, I would > prefer to keep symmetric keys out of scope. > > Although you are right that MAC-based implementations have a role to play > in the OAuth2 ecosystem, key distribution is a problem left to the > developer to solve; and all* the sample JWTs ATs I got from the providers > I worked with were signed with discoverable keys.* > > Again, that doesn’t mean that MAC-based implementations shoulnd’t be used: > only that this profile focuses on a solution that is as close to turnkey as > possible for developers, and that requests as little delta as possible to > providers already using JWT for their ATs. > I'm not trying to re-litigate the decision or question consensus but I will ask that you don't use the justification that "all the sample JWTs ATs I got from the providers I worked with were signed with discoverable keys" because I explicitly included several example JWT ATs in the samples that I provided that were using AEAD symmetric encryption, which is similar to MAC-based but with the added benefit of confidentiality of the claims payload. See also https://mailarchive.ietf.org/arch/msg/oauth/DAFccKDPJRhA5Z-vLIrx7u5XU4Q/ -- _CONFIDENTIALITY NOTICE: This email may contain confidential and privileged material for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited. If you have received this communication in error, please notify the sender immediately by e-mail and delete the message and any file attachments from your computer. Thank you._
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