Today, it's commonly known that computers are possible because of encrypted numbers.
Encryption is used to protect personal or business data from hackers or competitors.
Start your tour of cryptology on the Web at the National Cryptologic Museum . If you have a Java-enabled browser, you can visit the Bletchley Park home page and try the Enigma out for yourself. Just type in your message, and you'll see it appear in code on the screen. Now that you know what these machines can do, learn how they work at A-Z Cryptology . Read our Privacy Policy Statement .