“ Wrong problem Lost cards are not the big problem. Clerks copy your credit card numbers and sell them. And web sites which store credit card... (read full comment) ” 

Posted on September 20, 2010 at 9:56 AM EDT

“ Yes, you are right. "Requiring" that a particular symbol exists lowers the entropy, "Allowing" more symbols increases the entropy. Consider a 3... (read full comment) ” 

Posted on July 21, 2010 at 11:25 PM EDT