No, a traditional Certificate Authority (CA) cannot directly sign a PGP certificate in the same way they sign SSL\/TLS certificates. PGP uses a Web of Trust model, not a hierarchical trust system like CAs. However, you can import<\/em> a CA\u2019s root certificate into your PGP keyring to verify signatures made by keys that have been signed by that CA (or more accurately, by someone the CA trusts). This doesn\u2019t mean the CA \u2018signed\u2019 the PGP key itself; it means you trust the CA enough to accept their vouching for other keys.<\/p>\n It\u2019s important to understand how CAs and PGP work. <\/p>\n Certificate Authorities (CAs):<\/strong> Operate on a hierarchical trust model. You trust root CAs, they issue certificates to intermediate CAs, and those issue certificates to websites\/services. Obtain the CA Root Certificate:<\/strong> Download the root certificate from the CA\u2019s website in a suitable format (usually .pem or .crt). For example, you might download a Let\u2019s Encrypt root certificate. Verify the Import:<\/strong> Check that the certificate has been added to your keyring. Look for the CA\u2019s key ID in the output.<\/p>\n Trusting the Certificate (Optional, but Recommended):<\/strong> You can set a trust level for the imported CA root certificate. This tells PGP how much you rely on their vouching for other keys. Follow the prompts to set the trust level (e.g., \u2018ultimate\u2019 if you fully trust the CA).<\/p>\n Verify Signatures:<\/strong> When verifying a PGP signature, GPG will now consider the CA root certificate when checking for valid paths of trust. If the key that signed the message was signed by someone trusted by the CA (and you\u2019ve imported and trusted the CA\u2019s root certificate), verification should succeed.<\/p>\n Not a Direct Signature:<\/strong> The CA isn\u2019t directly signing the PGP key. They are vouching for someone who signed it, or for another key that vouches for it. Set the trust level back to \u2018never\u2019.<\/p>\n The post CA Signed PGP Certificates<\/a> appeared first on Blog | G5 Cyber Security<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" TL;DR No, a traditional Certificate Authority (CA) cannot directly sign a PGP certificate in the same way they sign SSL\/TLS certificates. PGP uses a Web of Trust model, not a hierarchical trust system like CAs. However, you can import a CA\u2019s root certificate into your PGP keyring to verify signatures made by keys that have […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-6389","post","type-post","status-publish","format-standard","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=\/wp\/v2\/posts\/6389"}],"collection":[{"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6389"}],"version-history":[{"count":0,"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=\/wp\/v2\/posts\/6389\/revisions"}],"wp:attachment":[{"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cybersecurityinfocus.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Understanding the Difference<\/h2>\n
\nPGP:<\/strong> Uses a Web of Trust. You personally decide who you trust, and their signatures vouch for others. There\u2019s no central authority.<\/p>\nSteps to Use a CA Root Certificate with PGP<\/h2>\n
\nImport the Certificate into your PGP Keyring:<\/strong> Use the gpg command to import the certificate.
\ngpg –import ca-root.pem<\/p>\n
\ngpg –list-keys<\/p>\n
\ngpg –edit-trust ca-root.pem<\/p>\n
\ngpg –verify signed-message.asc<\/p>\nImportant Considerations<\/h2>\n
\nWeb of Trust Still Applies:<\/strong> You still need to exercise your own judgment and verify keys independently as much as possible. Don\u2019t rely solely on CA root certificates.
\nRevocation:<\/strong> If a CA is compromised, you\u2019ll need to revoke trust in their root certificate within your PGP keyring.
\ngpg –edit-trust ca-root.pem<\/p>\n