Anything that uses encryption to keep content away from spying eyes. End-to-end encryption is the best, because there need be no trusted intermediary. Some software projects are always fully end-to-end encrypted. Examples include NNCP, Syncthing, Yggdrasil, and Gemini. For more on encryption, see: OpenPGP tools: GnuPG (GPG) Sequoia PGP Age (Encryption) signify (not encryption, but cryptographic authentication) Links to this note Encrypting Filespooler Jobs With Age Like the process described ...
