DigiNotar compromise (2011)
Dutch certificate authority DigiNotar was compromised in 2011. Attackers issued fraudulent certificates for Google, Yahoo, Mozilla, and other major sites. The breach was discovered after a fraudulent Google certificate was found in the wild.
All major browsers distrusted DigiNotar within weeks. The company went bankrupt.
Established the playbook for CA compromise response: immediate distrust, forensic investigation, and CA shutdown.
Shows what happens when a CA's private keys are compromised. The eMudhra situation may follow a similar path if the compromise is confirmed.
