OpenSSL is a widely-used open-source library that implements the TLS protocol and provides cryptographic functions for secure communication and data protection. Developers use it to add encryption, decryption, and SSL/TLS capabilities to applications that need to transmit sensitive data over networks or perform cryptographic operations. It serves as the foundation for HTTPS, secure email, VPNs, and other security-critical systems.

1,591 open issues · last updated Jul 22, 2026