Re: [TLS] ECH/ESNI - is accept confirmation calculation brittle in the face of errors?

2021-03-19 Thread David Benjamin
On Thu, Mar 18, 2021 at 4:07 PM Stephen Farrell wrote: > > Hiya, > > On 18/03/2021 19:17, David Benjamin wrote: > > I don't think I'd agree that *most* of the work is in the secret > > computation per se. Actually doing trial decryption with > > the secret requires reaching down into the record

Re: [TLS] ECH/ESNI - is accept confirmation calculation brittle in the face of errors?

2021-03-19 Thread Christian Huitema
On 3/19/2021 2:58 PM, David Benjamin wrote: On Thu, Mar 18, 2021 at 4:07 PM Stephen Farrell wrote: Hiya, On 18/03/2021 19:17, David Benjamin wrote: I don't think I'd agree that*most* of the work is in the secret > computation per se. Actually doing trial decryption with > the secret re

Re: [TLS] ECH/ESNI - is accept confirmation calculation brittle in the face of errors?

2021-03-19 Thread Stephen Farrell
Hiya, I agree with your analysis except for the very last part... On 19/03/2021 23:59, Christian Huitema wrote: We do have new information that this is somewhat costly to implement because it requires computing two handshake secrets on the client. On the other hand, it seems that the cost i