![]() This is the reason behind a pre master secret. To make things simpler, we would want a fixed-length value to derive the keys for any cipher suite we would want to use. Its length varies depending on the algorithm and the parameters used during the key exchange. The pre-master key is the value you directly obtain from the key exchange (e.g. This blogpost is about what happens between this key exchange and the encryption/authentication of data. The handshake can currently use 5 different algorithms to do the key exchange: RSA, Diffie-Hellman, Elliptic Curve Diffie-Hellman and the ephemeral versions of the last two algorithms. But as you may know, if you've read RFCs before, it is not easy to parse (plus they have some sort of double spaces non-sense).īefore we can encrypt/MAC everything with keys to secure our connection, we need to go over a key exchange called the Handshake to safely agree on a set of keys for both parties to use. TLS, Pre-Master Secrets and Master Secrets posted March 2016Įverything you want to know about TLS 1.2 is in RFC 5246. ![]()
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