Got a 22 in my first year Worried need some advice! Suppose a server that has tls13 but also likes tls12, when handshake occurs and client request have support for 12 then everything is fine The same as previous but client says it has 11 the the server rejection will blow up the entire socket connection, and actually 11 and backwards are considered totally insecure so the only real valid is 12 and 13 This is a good summary of the difference between TLS 13 vs 12 Very informative and yet concise!
Illustrative Mathematics
