Create Visuals.md

A list of visuals for decoration to be, perhaps, printed at a printshop, and resources / materials for use during the workshop, which can be printed on our printer.

Visuals/Visuals.md

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+# Visuals / resources / decorations:
+- 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.svg) 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…
+
+2256 = 115792089237316195423570985008687907853269984665640564039457584007913129639936
+
+There is a 1 in over 115 quattuorvigintillion (that’s a 78-digit number) chance of hash collision.
+
+# Resources / Materials:
+- paper plates/ cardboard cut in circles
+
+- scissors
+
+- rulers for drawing segments for letters, alternatively protractors (Can we borrow them from somewhere?)
+
+- pins for the cipher wheels
+
+- flipchart / whiteboard 
+
+- Vigenere square printed on A4 sheets groups of kids (Age 13-15) can use to encrypt their messages
+
+- Printouts with cryptography self-study resources (the links at the end of the instructions document);
+
+- printouts of decryption tasks;
+
+- printouts of frequency analysis texts for different groups: EN/FR/DE/LU (and ages 11-13/14+ if needed);
+
+- printouts with instructions for the different age groups /*how many copies per group?*/
+
+# Additional resources: 
+https://sites.google.com/site/codesforscouts/cryptogram
+
+Decoration:
+http://www.makeandtakes.com/3-secret-codes-to-try-with-your-kids
+
+examples of different cyphers: reverse alphabet, pigpen, Affine, etc.