I don't use GnuPG but I am asking on behalf of somebody else who does. How do you sign a message in GnuPG without encrypting the message itself? For example, like my message below.Many thanks in advance.For example:would be an example of a signed message using my PGP key StExo.-----BEGIN PGP SIGNATURE-----Version: GnuPG v1.4.12 (MingW32)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p31J-----END PGP SIGNATURE-----