[openssl-users] Selection of DHE ciphers based on modulus size of DH

Viktor Dukhovni openssl-users at dukhovni.org
Thu Jun 7 03:10:48 UTC 2018

> On Jun 6, 2018, at 7:15 PM, Salz, Rich via openssl-users <openssl-users at openssl.org> wrote:
> Without commenting on whether or not your understanding is correct (the client gets the params and can see how big the key is, no?), I will point out that the way DHE works is defined by the IETF RFC’s, and they have not changed.

However, in TLS 1.3, the FFDHE groups are pre-defined, and the server
does not get to choose ad-hoc (p, g) pairs.


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