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(Edit 2014-11-25: Reworded flushed out to phased out.) Short answer: From what I can tell, they will be gracefully phased out, not flushed out. (At least by Microsoft.) The old SHA1 root certs will expire regularly and Microsoft will no longer accept NEW SHA1-roots starting 2016. The old ones will stay in I guess, since they were compliant to the guidelines ...


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When a hash function has an output of size n bits, then: The generic algorithm for finding a preimage (or a second preimage) has average cost 2n evaluations of the hash function. The generic algorithm for finding a collision has average cost about 2n/2 evaluations of the hash function. By "generic" we mean "the algorithm that works against every hash ...



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