How to cancel public key

[Francis Gulotta]

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How would I revoke a key I no longer have a private key for? I
understand I can't do the same thing, but can I do something like the
opposite of signing? Signing against a key?

- -Francis

Patrick Brunschwig wrote:

> 
> You can revoke the keys you don't need anymore. Since you seem to be
> using Enigmail, the easiest is to open the Enigmail OpenPGP Key
> Management window, select the key you want to revoke, and choose "Revoke
> key" from the context menu. Then, you can upload your revoked key to a
> keyserver.
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