Used by thousands of teachers around the World!

Free Trial

STEP 1

Cracking Codes

STEP 2

Frequency Analysis


Get your favourite book and choose a paragraph in it.


Pick one that has at least 100 letters.


Use Microsoft Excel or Google Sheets to record how often each letter appears in the passage.



What is the most common letter in your text?

What is the least common?

CHALLENGE (OPTIONAL)


Try to decipher secret messages using online Frequency Analysis tools.



Online Caesar Cipher