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> You can have a good-faith "please delete this" but that doesn't stop another party from keeping it.

You can revoke your signature for that message, where it effectively ceases to be yours.

I don't think you can revoke a signature in a way that allows repudiation. You can only say, "I no longer stand by what I said," not "I never signed this."

I could be wrong, though. If you have links demonstrating this, please post them.

If the key is revoked, the digital signature done with this key is effectively revoked, since it no longer establishes identity. Look how CRLs work in PKI.

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