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OpenPGP is an influential standard for data authentication and encryption, employing public key cryptography to secure communications. Initially based on the proprietary PGP (Pretty Good Privacy) software, OpenPGP was formalized as an open standard by the OpenPGP Working Group within the Internet Engineering Task Force (IETF) starting in 1997. Today, OpenPGP serves as the backbone for secure email transactions globally, facilitating the signing and encryption of messages.

The standard not only provides robust encryption methods but also establishes a format for certificates that supports a unique web of trust, enhancing user security and reliability. OpenPGP's specifications are detailed across multiple IETF RFCs, allowing any entity to implement the technology without incurring licensing fees. Key documents include RFC 3156, RFC 4880 (the foundation of OpenPGP message format), and updates on implementing elliptic curve cryptography. Through its commitment to non-proprietary technology, OpenPGP continues to be a pivotal player in the field of secure communication.