- A strip of paper/ cardboard with the alphabet printed and cuts below, through which a second strip with the alphabet can be fitted and pulled to the left or right.
/*How long should it be? We can make it from A3 paper glued together*/
- A poster with the Alphabet and the number values of each letter, i.e. A=1, B=2, C=3 etc.
- ASCII table
- Braille poster with [Braille alphabet](Visuals/Braille.png) and [a challenge to solve](Visuals/Braille challenge.png)
- Vigenere square poster: [good-looking example](Visuals/Vigenere-cipher-cool-background.jpg) just as an idea what the poster should look like and a [usable file](Visuals/Vigenère_square_shading.png) in terms of size and usage rights
- A poster with an example of [Vigenere cipher with a keyword, e.g. code](Visuals/Vigenere-example-keywordcode.png)
- Pigpen / Masonic cipher [poster](Visuals/Pigpen-cipher-poster-idea.jpg) It's not labelled for reuse so we might need to create our own with this [image](Visuals/Pigpen_cipher-for-use.png)
- SHA-256 poster: /*don't know if we need it. Shall we go all the way to hash algorithms? But I love the text*/
**Why is 2^256 secure?**
What exactly is 2^256? Well, if we’re being technical…