On 04/10/16 01:00, Ángel González wrote:
> Not really. Their old roots could sign their new roots, which would
> be enough to make them work on the older devices where it worked. The
> cost of untrusting the old roots is probably similar to that of 
> adding new roots, so that the effort of chaining to a different CA
> is not worthwhile.

This is true as long as there is no gap between when you dis-trust the
old roots and when you add the new ones to your store. But that's
unlikely because dis-trusts normally happen fairly quickly, spinning up
new roots takes time, and you may want it to be done under a reformed
regime rather than under the old one.

Gerv


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