On 06/10/16 12:38, Jakob Bohm wrote:
> Which is why I have repeatedly suggested that maybe the rules should be
> changed to promote/demote some of the historic SHA-1 root certs into
> "SHA-1 forever" roots that can service older devices and browsers, even
> for regular websites concerned about allowing visits from older devices
> while transitioning their websites to HTTPS-only.

That has effectively happened; those roots have been removed from
current root stores, but if you talk to the right CA you can still get a
cert from one.

> Ideally, there should also be a way for TLS servers (such as web
> servers) to detect if the TLS client suffers from historic public key
> limitations such as SHA-1 only, low maximum DH key size etc., thus
> allowing the TLS server to use stronger certificates and FS keys for
> new clients.

Again, this exists - people use the cipher suite set, or support (or
lack of it) for TLS or TLS 1.2.

Gerv


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