OpenSSL 4.0 has been officially released, marking a significant update that introduces support for Encrypted Client Hello (ECH), substantially enhancing privacy protection capabilities. ECH effectively conceals the Server Name Indication (SNI) by encrypting the initial TLS handshake process, preventing network intermediaries from stealing domain name information accessed by users, thereby improving the security and privacy of network communications. This update also includes multiple feature enhancements, compatibility changes, and bug fixes, further improving the performance and stability of OpenSSL.
