Signed Posts allows authors to sign posts, assuring content integrity. Signature verification proves post-signing alteration hasn't occurred.

Daniel P.

Secure Encrypted Form

This plugin adds a secure form in your website that uses OpenPGP encryption to secure sensitive communications.

arnesonium

OpenPGP Form Encryption for WordPress

OpenPGP public key encryption for any textarea with a shortcode button.

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ArchivioID

OpenPGP signature verification, multi-signer workflows, key lifecycle management, and public proof pages for ArchivioMD.

Marc Armengou

Signed Posts allows authors to sign posts, assuring content integrity. Signature verification proves post-signing alteration hasn’t occurred.
Features:
<ul>
<li>In-browser verification: The signature verification is done on the client side (in the visitor’s browser).</li>
<li>Methods: OpenPGP (ASCII-armored detached signature) and DID (did:key, did:web) using Ed25519 detached JWS (b64=false).</li>
<li>Source of trust: For OpenPGP, the author specifies the URL of their public key in their profile. For DID, the author sets their DID (did:key or did:web). For did:web, the plugin fetches <code>https://<host>/.well-known/did.json</code>.</li>
<li>Status block: An informative block is automatically added to the end of each signed article, showing the verification status (valid, invalid, or error).</li>
<li>Author badge: The author name in posts is enhanced with an icon and KeyID/fingerprint text.</li>
</ul>
<h3>Source Code and Libraries</h3>
OpenPGP.js 
* Version: 6.2.2 
* License: LGPL-3.0-or-later 
* Public Source Code: https://github.com/openpgpjs/openpgpjs
Web Crypto API 
* Used to verify Ed25519 signatures for DID.

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