I am currently trying to solve an exercise where I should look at a TLS 1.2 handshake trace while having access to pre and both randoms (server random and client random).

In order to decrypt application data, I need to rebuild the master key.

But I am struggling with finding the section where it is negotiated how this master key is actually built from pre and randoms.

How does TLS 1.2 handle that? Is there maybe a default handling?



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