Re: F37 Proposal: Strong crypto settings: phase 3, forewarning 1/2 (System-Wide Change proposal)

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* Kevin P. Fleming:

> In a similar (parallel) discussion related to future RHEL, it has been
> found this change also breaks resolution of many DNSSEC-secured
> domains which are still using SHA1 signatures. It is impossible to
> know how long it will be before those domains upgrade to better
> signatures, and at the moment it's rather challenging for resolvers to
> be able to determine that the resolution failure was caused by local
> policy instead of an actual invalid signature.

At least that's a solvable problem: perform DNSSEC validation (to
prevent actual attacks) and pretend to clients that you didn't do it (to
avoid relying on signatures which aren't policy-confiorming).  DNSSEC
supports that approach quite well for ordinary record types.  It's
different from the web, where https:// and http:// are not equivalent in
practice for many domains, and the schema is also visible to Javascript.

Thanks,
Florian
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