In case you weren't aware, a vulnerability in the public key infrastructure (PKI) of Secure Sockets Layer (SSL) has been in the news recently. Is it a big deal? It's definitely a problem highlighted by some important and great research in the field.
Criminals are constantly finding new ways to get a hold of your credit card number and expiration date. Businesses to whom you give your credit card information are constantly finding ways to lose this information. Why is it so easy to steal credit card numbers, and should you be worried?