I have someone's PGP Public Key (.asc) and would like to import that into Keychain Access.app so that I can email them with my existing PKI certificates which I already use with Mail.app. How can I do this?
How to import a PGP public key into Keychain Access.app
encryptionkeychain
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Best Answer
I think you're trying to mix two different encryption schemes here: S/MIME and PGP. Mail.app supports S/MIME by default, so I guess that's what you're currently using. PGP support can be added by installing the Mail plugin that is part of the GPG Suite. After you also generate a PGP key for yourself, you can use both S/MIME and PGP encryption. You can receive and decode both, and for each email you're sending, you can choose which one to use.
GPG Suite contains a separate GPG Keychain app for PGP keys.