Code Breakers  
 
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.

 
 
Frequency Analysis - Letters in Text

Back to Codebreakers

Frequency Analysis is a technique used by code breakers and is the primary cryptanalytic tool. In English 'e' is the most common letter, followed by 't' and then 'a'. See graph of letter frequency analysis. When we analyse a code we can compare it to the letter frequency analysis graph and hopefully break the code. Copy and paste in text from websites and compare your graph to our graph.

To complete a frequency analysis of letters in a text click here.
To complete a frequency analysis of the number of letters per word in a text click here.

Frequency Analysis of Letters in a Text

Plain Text





Statistical work: Compare the frequency analysis outcomes on various English texts? What outcomes are there for other languages? You can print the text and graphs from the website to put in your coursework. Use our word-length counter and compare different websites. Note: words that are hyphenated will only count as one word, such as word-length !!



 

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