The Caesar cipher, ... Shift the entire alphabet by the number you picked and write it down below your original alphabet (as shown above). Pick a message to write to your friend.

Some ciphers have simple keys, others, complex ones. The key for a cipher used by Augustus Caesar, some 2,000 years ago, was simple enough: The receiver just had to shift the alphabet one position.

Decode the cipher below. As you discover what each encrypted letter represents, print it over the actual letter in the following alphabet. cipher: ...

Well it seems that the Daves are not the only ones who enjoy a good code cracking puzzle. Melanie Croos-Dabrera also enjoys a cryptographic conundrum. Her hard work and some random number ...

The most common cipher is an alphabet cipher. Morse code, in spite of its name, is a simple cipher — each letter is encoded in dots and dashes.

In such a cipher, each letter of the alphabet is replaced with a particular symbol. But a simple substitution cipher is easy to crack because certain letters, such as “e,” appear much more ...

Find easy instructions to help your child put together a super secret cipher wheel. Created in partnership with the Science Museum Group, you can try this at home with items lying around you house.

The concluding words of Unsolved! are a call to action. Craig Bauer, a US mathematician and editor-in-chief of the journal Cryptologia, ends his hefty history of cryptography by noting that even ...