TLS 1.2 vs 1.3: 1-RTT handshake, simplified cipher suites, and the 0-RTT replay risk
TLS 1.3 (RFC 8446, 2018) ships in over 90% of HTTPS connections today. The differences from 1.2 go far beyond new algorithms — handshake redesign, cipher-suite cleanup, encrypted certificates, and 0-RTT for resumed sessions. This article walks through the mechanism and operational impact.
· 5 min read