Re: Microsoft PlayReady WMRMECC256 Key / root key issue (attack #5)

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Posted by Security Explorations on Aug 13

Hello All,

In my previous post, I shamefully confused two root keys (WMRMECC256
and ECC256MSBCertRootIssuer) while decribing the issue pertaining to
one of them.

The key exploited in the attack is called ECC256MSBCertRootIssuer Key
(not the WMRMECC256) and is identified by the following public
component:

86 4D 61 CF F2 25 6E 42 2C 56 8B 3C 28 00 1C FB
3E 15 27 65 85 84 BA 05 21 B7 9B 18 28 D9 36 DE
1D 82 6A 8F C3 E6 E7 FA 7A 90 D5 CA 29 46 F1…

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