We prepared some powerpoint slides that you might find helpful as the basis for class or a maths club activities, so please download them and let us know what you think. If you have any suggestions to improve them and are happy for us to use your suggestions let us know in the suggestions page on the forum.

You might also find the notes on codebreaking and programming are useful.

The Caesar shift cipher and pattern detection Powerpoint slides

Frequency analysis Powerpoint slides

The affine shift cipher Powerpoint slides

Breaking the affine shift cipher using modular inverses Powerpoint slides

The keyword cipher Powerpoint slides

Cracking a keyword cipher using frequency analysis and cribs Powerpoint slides

Programming for Cryptologists 101 pdf, by Julian Bhardwaj

A beginner’s guide to codebreaking pdf, by Graham A. Niblo