To show that you trust and vouch for the genuineness of someone's key, you can sign it. A person's key must be signed only after you compare the user ID on the key with a valid proof of their identity, such as a passport, driver's license, or similar. If the two IDs match, the key is said to be trustworthy.
Import the remote key or
keyfile containing the key to be signed
into
From the list of
Right click the key and select
Press the
Depending on how carefully you have checked the key, choose one out of
Decide if you want to revoke your signature at a later date and if you want to make your signature public, by ticking the checkboxes provided.
When you own more than one PGP key, select the key you want to sign
with, from the list next to
Press the
When you create a new