The FBI's latest call for great legal power to spy on online chats as the happen is just a sign of the perpetual cat-and-mouse between police enforcing the law and criminals trying to dodge it. The next likely move for criminals (and other, totally legal private citizens uncomfortable with the idea of warrant-free chat monitoring): casual cryptography. Protocols for off-the-record chats already exist, and will ensure that conversations remain only between known parties, without someone else eavesdropping. What's this mean? Expect me in five years to be writing about how the FBI wants a legal backdoor around encrypted conversations. Oh, wait.