Re: [OAUTH-WG] ECDH-1PU encryption algorithm

[Dave Tonge <[e-mail]>]

Hi Neil

I'd be interested in seeing this draft discussed.

Dave

On Wed, 5 Aug 2020 at 12:02, Neil Madden <[e-mail]> wrote:

> Hi all,
>
> You may remember me from such I-Ds as
> https://tools.ietf.org/html/draft-madden-jose-ecdh-1pu-03, which proposes
> adding a new encryption algorithm to JOSE. I’d like to reserve a bit of
> time to discuss it at one of the upcoming interim meetings.
>
> The basic idea is that in many cases in OAuth and OIDC you want to ensure
> both confidentiality and authenticity of some token - for example when
> transferring an ID token containing PII to the client through the front
> channel, or for access tokens intended to be handled by a specific RS
> without online token introspection (such as the JWT access token draft). If
> you have a shared secret key between the AS and the client/RS then you can
> use symmetric authenticated encryption (alg=dir or alg=A128KW etc). But if
> you need to use public key cryptography then currently you are limited to a
> nested signed-then-encrypted JOSE structure, which produces much larger
> token sizes.
>
> The draft adds a new “public key authenticated encryption” mode based on
> ECDH in the NIST standard “one-pass unified” model. The primary advantage
> for OAuth usage is that the tokens produced are more compact compared to
> signing+encryption (~30% smaller for typical access/ID token sizes in
> compact serialization). Performance-wise, it’s roughly equivalent. I know
> that size concerns are often a limiting factor in choosing whether to
> encrypt tokens, so this should help.
>
> In terms of implementation, it’s essentially just a few extra lines of
> code compared to an ECDH-ES implementation. (Some JOSE library APIs might
> need an adjustment to accommodate the extra private key needed for
> encryption/public key for decryption).
>
> I’ve received a few emails off-list from people interested in using it for
> non-OAuth use-cases such as secure messaging applications. I think these
> use-cases can be accommodated without significant changes, so I think the
> OAuth WG would be a good venue for advancing this.
>
> I’d be interested to hear thoughts and discussion on the list prior to any
> discussion at an interim meeting.
>
> — Neil
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>


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