Yahoo says it has notified an undisclosed number of users that their private information may have been accessed using forged cookies in connection with a previously disclosed hack in 2014.
A Yahoo sign at the company's headquarters in Sunnyvale, Calif. The company has announced a hacking of user accounts that happened in 2013, but it says payment card information was not accessed.
Marcio Jose Sanchez/AP
Yahoo Chief Information Security Officer Bob Lord on encryption: "Yes, it's used by terrorists. It's also used by people who are looking to voice their opinions on issues and to save lives."