How to cancel public key

[Patrick Brunschwig]

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You can't. If you have lost your private key, there's no way you could
revoke the public key anymore. That's why it's important to create a
revokation certificate and store it safely (and maybe even print it, so
that you could type it if all other means fail).

- -Patrick

Francis Gulotta wrote:
> 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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