Late last month, a US federal court judge sentenced a Russian cyber criminal Dimitry Belorossov to four-and-a-half years in prison. Apparently, the not-so-nice Mr. Belorossov was guilty of using a computer virus to steal money from unwitting victims. His hacking tool of choice was a software program called Citadel. Citadel is a kind of malware known as a Trojan. It fools victims into giving criminals user IDs and passwords. It can also steal other other important information a user types into their device when they’re online.