age
Modern file encryption tool + format. Filippo Valsorda, 2019. PGP replacement for simple file crypto. Simple CLI: age -r alice.pub file.txt > file.age. X25519 + ChaCha20Poly1305 default.
Design idea: only one way to do each thing (opposite of GPG sprawl). Recipients: X25519 pubkeys, SSH keys (Ed25519, RSA), passphrase. SOPS integration: can encrypt YAML/JSON fields with age keys. Rage is Rust implementation. Adoption: Mozilla, NixOS, MMD projects. PGP replacement for config secrets, backup encryption. For E2EE chat: use Signal instead, age is file-focus. RFC process ongoing for formalization.