AT&T notifies regulators after customer data breach

**Executive summary:** AT&T confirmed that a publicly dumped dataset of 73 million customer records—including names, contact details, dates of birth, Social Security numbers and encrypted account passcodes—was authentic; the company notified over 51 million people, reset affected account passcodes after researchers found the encrypted passcodes were easy to decipher, and is offering identity monitoring while the source of the leak has not been identified.