Àmì Plugin: openpgp
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Secure Encrypted Form
This plugin adds a secure form in your website that uses OpenPGP encryption to secure sensitive communications.
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OpenPGP Form Encryption for WordPress
OpenPGP public key encryption for any textarea with a shortcode button.
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Signed Posts
Signed Posts allows authors to sign posts, assuring content integrity. Signature verification proves post-signing alteration hasn't occurred.