Praxis mit GnuPG Signieren und Signatur testen: $ gpg --sign $DATEI You need a passphrase to unlock the secret key for user: "Alice (Crypto Girl) " 1024-bit DSA key, ID 69EEE24D, created 2004-11-28 gpg --verify $SIGNATUR-DATEI gpg: Signature made Sun Nov 28 19:25:09 2004 CET using DSA key ID 69EEE24D gpg: Good signature from "Alice (Crypto Girl) "