OpenPGP public key encryption for any textarea with a shortcode button.
Plugin Tag: pgp
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wp2pgpmail
A simple PGP Mail Form Plugin. Enter your PGP public key, then visitors will be able to send you PGP encrypted messages by mail from a form.
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WP PGP Encrypted Emails
Signs and encrypts emails using PGP/GPG keys or X.509 certificates. Provides OpenPGP and S/MIME functions via WordPress plugin API.