Скачать или смотреть How to connect to tlsv1.3 tutorial openssl wireshark

Reference: https://8gwifi.org/docs/tlsv13.jsp

TLS stands for Transport Layer Security and is the successor to SSL (Secure Sockets Layer). TLS allows client/server applications to communicate over the Internet in a way that is designed to prevent eavesdropping, tampering, and message forgery.
This write-up mostly focus on TLSv 1.3. TLS 1.3 was defined in RFC 8446 in August 2018. It is based on the earlier TLS 1.2 specification.

Major Differences from TLS 1.2
From the Wireshark packet capture, its clearly visible the TLSv.1.3, the number of TLS Handshake packets is being reduced this offer better speed in TLS v1.3 , and some of the major changes from TLS1.2 as follows
TLS 1.3 Handshake
TLSv1.3 Ciphersuites
openssl Start the TLSv1.3 server
openssl s_server -accept 443 -tls1_3 -ciphersuites TLS_AES_256_GCM_SHA384 -key key.pem -cert cert.pem

Openssl Connect to TLSv1.3
openssl s_client -connect 127.0.0.1:443

TLSv1.3 server with Preshared Key
PSK=b2c9b9f57ef2fbbba8b624070b301d7f278f1b39c352d5fa849f85a3e7a3f77b
openssl s_server -accept 443 -tls1_3 -ciphersuites TLS_AES_256_GCM_SHA384 -key key.pem -cert cert.pem -psk $PSK

Connect the TLSv1.3 server with same PSK

PSK=b2c9b9f57ef2fbbba8b624070b301d7f278f1b39c352d5fa849f85a3e7a3f77b
openssl s_client -connect 127.0.0.1:443 -tls1_3 -psk $PSK