Like the Playfair, the Double Playfair cipher uses 5x5 squares ... IS FULL OF EELS," we begin by choosing a period or number of letters (say, seven), then breaking the message into groups of ...

Another cipher gets in the way of Indy's adventure in Indiana Jones and the Great Circle, and here's exactly how players can ...

To solve this you need to match the number to the cipher letter and input that in the relevant space. Each time you solve one a new one appears, so all you have to do is work through each in turn ...

This was one of the most secure hand ciphers used in the Second World ... A T H E R S M E L T O F E L D E R B E R R I E S Now number the letters in the keyword in alphabetical order.

A cipher is a code used to protect information ... Now you can encrypt messages with numbers instead of letters. You could start by making A = 1, B = 2 and C = 3, but once you've practised a ...