when will Mozilla support Expect-CT, a new security header
"Expect-CT is a new security header which is, at the moment, only supported by Chrome and Opera browsers. It allows a website to instruct the browser to reject any certificate not found in Certificate Transparency, a read-only public log of certificates which can be audited. Because Expect-CT is an HTTP header, it is a trust-on-first-use protocol that relies on long-term caching to ensure security. While Expect-CT does not prevent a compromised Certificate Authority from issuing a fake certificate, it does limit the damage by forcing the addition of the certificate to the log. The domain owner can then report the fake certificate and attempt to get it revoked." [Protonmail]
Chosen solution
Expect-CT (Certificate Transparency) isn't really a new concept as it goes back to 2014.
Certificate Transparency has been implemented in Firefox for telemetry, but is disabled because of negative impact on the performance.
If you want to spend some time on reading:
- https://developer.mozilla.org/en-US/docs/Web/Security/Certificate_Transparency
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect-CT
- https://wiki.mozilla.org/PKI:CT
security.pki.certificate_transparency.mode (0 | 1)
Some related bug reports:
- Bug 1281469 - Implement Certificate Transparency support (RFC 6962)
- Bug 1349941 - Support Expect-CT for Opting-in to Certificate Transparency [RW]
- Bug 1353216 - certificate transparency signature verifications negatively impact TLS handshake performance
- Bug 1355903 - Re-enable Certificate Transparency telemetry collection
(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)
All Replies (1)
Chosen Solution
Expect-CT (Certificate Transparency) isn't really a new concept as it goes back to 2014.
Certificate Transparency has been implemented in Firefox for telemetry, but is disabled because of negative impact on the performance.
If you want to spend some time on reading:
- https://developer.mozilla.org/en-US/docs/Web/Security/Certificate_Transparency
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect-CT
- https://wiki.mozilla.org/PKI:CT
security.pki.certificate_transparency.mode (0 | 1)
Some related bug reports:
- Bug 1281469 - Implement Certificate Transparency support (RFC 6962)
- Bug 1349941 - Support Expect-CT for Opting-in to Certificate Transparency [RW]
- Bug 1353216 - certificate transparency signature verifications negatively impact TLS handshake performance
- Bug 1355903 - Re-enable Certificate Transparency telemetry collection
(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)