It isn’t surprising that criminals would want to encrypt messages. Some need cipher systems to communicate securely with each other. Others who work alone may want to conceal the contents of diaries or notebooks they hope no one else will ever read. A few—think Batman’s adversary ...read more

Killers usually go to great lengths to avoid the police and media attention, but the self-proclaimed Zodiac, who terrorized the Bay Area in the late 1960s and early 1970s, was an exception. He called the police on two occasions to report murders he had committed and sent dozens ...read more