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Don't let your messages fall into the wrong hands.

Send secret messages to your friends and decipher your own messages. Can you break our codes and reveal their secret contents? How good are you as a codebreaker?

For thousands of years secret messages have been sent around the world. The techniques used to encrypt a message have become more and more complicated. Now thousands of words can be hidden in a pixel of a photograph with little hope of being found by anyone but the intended receiver.

Here we look at some of the simpler ways of encrypting messages.

Write your own message, encrypt it and then e-mail your message to a friend. Wait for the reply, - can you decipher it? Try to decipher our secret limericks. Click on the cipher you want to use.

  
 
Ciphers

A cipher is the name given to any form of cryptographic substitution in which each letter is replaced by another letter or symbol.

The Caesar Shift Cipher was the first documented cipher used for military purposes. A very simple way to encrypt messages, but fairly easy to break!

The General Monoalphabetic cipher is a complex cipher and hence it is almost impossible to break the code. We've even added in The Caesar Cipher to make it more difficult.

The Rail Fence Cipher uses letter transposition to generate an incredibly difficult anagram to solve.

The ASCII Code Converter brings code breaking up to date. The code is shown as a series of digits all based on the modern computer keyboard.

The Clock Code is a variation on the general monoalphabetic cipher used above, but using a clock.

Frequency Analysis was one technique code breakers used. Here we have some statistical tools that will be useful for statistics projects undertaken in school.


 


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