OpenPGP

OpenPGP is the gold standard for end-to-end encryption, securing email and data through the RFC 4880 open standard.

OpenPGP provides the cryptographic backbone for secure communication by leveraging asymmetric key pairs (RSA or ECC) to sign and encrypt digital content. Originally derived from Phil Zimmermann’s 1991 PGP software, it now powers essential tools like GnuPG (GPG) and protects millions of sensitive messages across global networks. By decoupling encryption from specific vendors, it ensures long-term data sovereignty and verifiable identity through a decentralized web of trust.

https://www.openpgp.org/