Blacklisted Certificates: Google, Mozilla, Microsoft Act Against Turktrust

Turktrust, the Turkish CA (certificate authority) responsible for issuing an intermediate CA certificate that was later used to generate an unauthorized certificate for google.com, claims that the bad Google certificate was not used for dishonest purposes. On Thursday, Google, Mozilla, and Microsoft announced that they are blacklisting two intermediate CA certificates that were mistakenly issued by Turktrust in August 2011 for two of its customers who should have received normal end-entity certificates for their respective domain names.

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