Lo scambio di chiavi deve avvenire utilizzando un canale sicuro.
Una chiave ha questa forma:
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.2.3 (GNU/Linux)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=mddK
-----END PGP PUBLIC KEY BLOCK-----
Dettarla o controllare a occhio che non sia stata modificata è faticoso!!!