Yahoo says hack affected all accounts

Yahoo announced Tuesday that the monumental data breach it revealed late last year affected all 3 billion accounts on its online service, three times more than initial estimates. The number of hacked accounts represents nearly “half the world,” said Sam Curry, chief security officer for Boston-based cybersecurity firm Cybereason, though there’s likely more affected accounts than actual users. The stolen information included names, email addresses, phone numbers, birthdates, and security questions and answers but not passwords or payment information. Yahoo already asked all users to change their passwords and security questions in response to the hack. In March, the Justice Department charged two Russian intelligence agents and two hackers in the cyberattack. U.S. authorities said cybercriminals gave Russian officials access to specific accounts they were targeting, and the officials helped the criminals evade authorities and let them keep stolen information they could sell. The case was the first to directly implicate the Russian government in cybercrime against the United States.