Letter Frequency Analyser

Introduction

For a simple substitution cypher, any letter, in any language, will always be represented as the same symbol in the output. This tool analyses the frequency of each letter or number in a piece of encrypted text. This can then be compared with known frequency distribution as the first stage of decryption.

Note that if the original text contains a double letter, such as 'ee' then the output will also contain a double symbol. However English has very few such double letters, so if the output contains such a pair, the codebreaker immediately knows that it is likely to represent 'ee', 'oo', etc.

Instructions

1. Type, or Copy-and-Paste the text to be decrypted into the text box below.
2. Click the 'Analyse' button below the input fields.
3. The results will be displayed below.
4. To do further analysis' simply change the text in the input field, and then click the 'Analyse' button again.