Why thousands of retailers' POS terminals stopped working

On December 7, when thousands of retailers' credit card terminals suddenly stopped working, some wondered if they were the victim of a security breach. Fortunately, the mishap was instead blamed on the expiration of a cryptographic certificate used in older payment terminals made by Hypercom.

"The security mechanism was triggered by the rollover of the date and not by any attack on or breach of the terminal," said Stuart Taylor, vice president of payment solutions at Equinox Payments, which owns the Hypercom brand. Story