One way is to encrypt the message—that is, use a secret code that only you and your friend know. Try this activity to learn how to create your own “Caesar cipher,” a popular type of code ...

Computer scientist Kevin Knight and two Swedish researchers have broken the code to the 105-page manuscript, and NPR's Daniel Hajek reports on what the Cipher revealed. The cryptic text of a 250 ...

Putting aside concerns about Yardley's age -- he was only 28 years old -- Van Deman chose him to create the Army's first code and cipher bureau, known originally as the American Cryptographic ...