Which is why the "web of trust" exists. And why people do keysignings at NANOG events. And why, at least on my mail client, the signature shows the email address of its owner. If Scott spoofs and email from me and signs it with his key, people will notice. -C
If people judge authenticity based on the simple fact that a message is signed, that's just as useless. Why wouldn't the spoofed email be signed with somebody else's key, to make it past all those people who merely check to see if it's signed?
The _only_ way to verify authenticity is to check the signature. By signing every single email sent, you endanger yourself by allowing your recipients to judge the authenticity of your emails simply by the existence of a pgp signature.
Therefore, you should only sign emails that contain information important enough that verification is necessary, otherwise nobody will check.
Andy
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