Hello Jan,

Thank you for your answer.

Op do 4 apr. 2019 om 12:40 schreef Jan Just Keijser <janj...@nikhef.nl>:

> so the TLS cipher name includes names for both symmetric encryption and
> symmetric authentication *separately* : with GCM ciphers you do both of
> them in one go, but the TLS cipher still lists them separately.
>

I understand that, but since GCM already handles both encryption and
authentication, I was wondering what the SHA-384 (which is not part of
AES-GCM) was used for. Might it indicate the PRF used for key derivation?
Are there perhaps two authentication tags used for the control channel
(GHASH and SHA-384)?

Also note that this cipher is the cipher used for the *control channel*,
> not for the data channel and is the result of the  "regular" TLS
> negotiation that happens when the control channel is established.
>

Thanks, I was not fully aware that the data channel was negotiated
separately from this cipher suite.
Kind regards,

Pieter
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