GnuPG è un'implementazione libera e completa dello standard OpenPGP (RFC 4880) per la crittografia e la firma digitale.
Gestione delle chiavi (Key Management)
# Generate & List Keys
gpg --full-gen-key
gpg -k # List public keys
gpg -K # List secret/private keys
# Export & Import
gpg -o key.asc --armor --export <KEY_ID>
gpg --import key.asc
# Keyserver Synchronization
gpg --receive-keys <KEY_ID>
gpg --send-keys <KEY_ID>
gpg --refresh-keys
Crittografia e decrittografia
# Asymmetric Public-Key Encryption
gpg -e -o secret.txt.gpg -r "[email protected]" secret.txt
# Symmetric Passphrase Encryption
gpg --symmetric secret.txt
gpg -c secret.txt
# Decrypting Files
gpg -d -o secret.txt secret.txt.gpg
Firme digitali, verifica e demoni
# Digital Signing & Verification
gpg -o signed.txt.gpg -s file.txt
gpg --clearsign file.txt
gpg -b file.txt # Detached signature
gpg --verify file.txt.sig file.txt
# Daemons & Machine Parsing
gpgconf --list-components
gpgconf --kill gpg-agent
gpg -k --with-colons