Dutch security firm DigiNotar has filed for voluntary bankruptcy following a series of attacks by a hacker.

The attackers penetrated DigiNotar's internal systems and then issued fake security certificates so they could impersonate web firms. The certificates are believed to have been used to eavesdrop on the Google email accounts of about 300,000 people.

The hacker behind the attacks claims to have penetrated four other firms that issue security certificates.

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