Let's Encrypt is a fairly new certificate authority, but it's also one of the world's leading. The service was a major player in the push to make the entire Web run over HTTPS, and as a free, open issuing authority, it went from zero certs to one billion certs in just four years.
Yesterday, Let's Encrypt announced it had found a solution that will let those old Android phones keep ticking, and the solution is to just... keep using the expired certificate from IdenTrust? Let's Encrypt says "IdenTrust has agreed to issue a 3-year cross-sign for our ISRG Root X1 from their DST Root CA X3. The new cross-sign will be somewhat novel because it extends beyond the expiration of DST Root CA X3. This solution works because Android intentionally does not enforce the expiration dates of certificates used as trust anchors. ISRG and IdenTrust reached out to our auditors and root programs to review this plan and ensure there weren’t any compliance concerns."
Yesterday, Let's Encrypt announced it had found a solution that will let those old Android phones keep ticking, and the solution is to just... keep using the expired certificate from IdenTrust? Let's Encrypt says "IdenTrust has agreed to issue a 3-year cross-sign for our ISRG Root X1 from their DST Root CA X3. The new cross-sign will be somewhat novel because it extends beyond the expiration of DST Root CA X3. This solution works because Android intentionally does not enforce the expiration dates of certificates used as trust anchors. ISRG and IdenTrust reached out to our auditors and root programs to review this plan and ensure there weren’t any compliance concerns."
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