NOVA scienceNOW's "Can Science Stop Crime" introduced you to Tadayoshi Kohno, a University of Washington computer scientist who's made it his mission to take over networked machines, identifying ...

Ever since writing has existed, people have wanted to send secret messages to one another--and others have wanted to intercept and read them. This is the third installment of the blog series taking ...

Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...

It took more than eight years for a CIA analyst and a California computer scientist to crack three of the four coded messages on the CIA's famed Kryptos sculpture in the late '90s. Little did either ...

Edgar Allan Poe was fascinated by ciphers, going so far as to create a story, The Gold Bug, centered around the solution to one. Less well known is an article Poe wrote for Graham's Magazine in 1840 ...

1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes -- 7. Ciphers for spies -- 8. Producing random ...