coondoggie writes: "Breaking written codes is seemingly a black art whose history dates back as long as people could write and wanted to keep secrets. In the age of supercomputers and all manner of advanced technologies it's hard to imagine much cryptography expertise is still needed. The FBI would tell you differently. According to the FBI criminals who use cryptography-codes, ciphers, and concealed messages-are abundant. "Terrorists, gang members, inmates, drug dealers, violent lone offenders, and organized crime groups involved in gambling and prostitution use letters, numbers, symbols, and even invisible ink to encode messages in an attempt to hide illegal activity," the FBI stated."