sshuber writes "I just received a notice from my bank that Mastercard alerted them that my credit card information used recently for an online purchase was breached. The catch is that it doesn't list the company but just recommends to check for fraudulent activity and to order a new card. Is there any way to find out which company it was that exposed my data? How can I verify that my information was properly encrypted? If proper measures weren't taken, I would certainly shop elsewhere."