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Create a Revocation Certificate
A revocation certificate of a key is sent to others to notify them that you cannot or do not want to use this key any more. Reasons: Somebody "stole" and discovered the passphrase of your key so that using the key is not safe any more; or you lost the key; or you made a new one that you prefer; or you have any other reason. Others import this revocation certificate into their keyring, as a warning not to use it any more.
It is a good idea to make a revocation certificate when you create the key and store it some place. For when you lost your key, you cannot make a revocation certificate anymore. (This program does that automatically.)
Steps:
Done.