revoked certificate

Failing this, a revoked certificate may be incorrectly accepted as valid.

That's the way they handled the DigiNotar problem was they immediately added knowledge of the revoked certificates to the browser, and it just knows not to believe any of those.

They would, when they saw you trying to go to login.yahoo.com, they would accept the connection, respond using their fraudulent and revoked certificate, which your browser doesn't know is revoked.

In August 2011, following complaints of inflated job-placement rates, the Texas Workforce Commission revoked certificates of approval for 22 of the chain's programs, and put all the Texas campuses on probation.