![]() The server selects the preferred version of the SSL/TLS protocol from among those presented by the client. A Server Hello may either contain selected options (from among those proposed during Client Hello) or it may be a handshake failure message. Here’s what an actual Client Hello looks like in a Wireshark capture.Īfter the server receives the Client Hello, it replies with a Server Hello. If the server cannot provide the additional functionality, the client may abort the handshake if needed. ![]() This can be done via extensions such as supported groups for elliptic curve cryptography, point formats for elliptic curve cryptography, signature algorithms, and more. The client can request additional functionality for the connection. However, compression is risky and recommended against: see information on CRIME and BREACH attacks. If you use compression, you can lower bandwidth usage and speed up transfers. This is a list of method that is going to be used for compressing data (before encrypting it).
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