> On 11 May 2020, at 07:41, Torsten Lodderstedt <tors...@lodderstedt.net> wrote:
> 
>> On 11. May 2020, at 07:38, Neil Madden <neil.mad...@forgerock.com> wrote:
>> 
>> There is no attack that this prevents so your claim of improving security is 
>> unsubstantiated. I can’t see how we can ship a 2.1-compliant-by-default AS 
>> while this requirement remains so I don’t support it. 
> 
> Are you saying PKCE does not prevent any attack?

No, but servers and clients are already free to support PKCE. I’m saying that 
rejecting requests from non-PKCE clients doesn’t prevent any attack. It just 
denies service to legitimate clients. 

— Neil
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