ClientHello 2 – Secrets and Keys in TLS 1.3

• Kevanna Brown
• 02/20/202408/31/2024
• 0

Listing 12.2: ClientHello message structure uint16 ProtocolVersion;opaque Random[32];uint8 CipherSuite[2]; /* Cryptographic suite selector */struct {   ProtocolVersion legacy_version = 0x0303; /* TLS v1.2 */   Random random;   opaque legacy_session_id<0..32>;   CipherSuite cipher_suites<2..2^16-2>;   opaque legacy_compression_methods<1..2^8-1>;   Extension extensions<8..2^16-1>;} ClientHello; In turned out, however, that the implementation of TLS version negotiation was flawed in many TLS servers. As a result, servers would reject a well-formed ClientHello message…