[Openid-specs-fapi] Issue #245: FAPI-CIBA: Client Authentication at Backchannel Authentication Endpoint (openid/fapi)
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Wed Jul 3 01:25:02 UTC 2019
New issue 245: FAPI-CIBA: Client Authentication at Backchannel Authentication Endpoint
It would be kind to state explicitly that client authentication at the backchannel authentication endpoint should follow the guidance written in the FAPI spec. Especially, about the natural conclusion that the following are affected by FAPI requirements.
1. **Client authentication method** \(`client_secret_basic` and `client_secret_post` are not allowed. `client_secret_jwt` is not allowed for Read-and-Write. `private_key_jwt`, `tls_client_auth`, `self_signed_tls_client_auth` are allowed for both Read-Only and Read-and-Write\)
2. **Size of signing key** of client assertion \(RSA: 2048 or larger, EC: 160 or larger\)
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