Caesar cipher wheel can be used for teaching cryptography or for a game with children. It's actual size is the size of CD/DVD (120 mm in diameter). The inner wheel is 90 mm in diameter and there are two types: + with alphabet clockwise and - with alphabet counterclockwise.
The cipher can be negotiated in advance and may not be part of the message itself, or can be at the beginning or at the end of the message.
This cipher is on the photo of the prototype.
black & white
To use this thing just insert small wheel to the big wheel. If is it too tight you can use sandpaper to decrease the diameter of the small wheel.
It is designed in OpenSCAD. This week I saw similar cipher but on paper, so I decided to design it for 3D printing.
Overview and Background
Lesson Plan and Activity
Divide students to pairs, one can encrypt a message, write it down to paper and the other student will decrypt it, and vice-versa. Lesson learned - how ciphers and cryptography works.
just this wheels, pen and paper.
- cryptography bases
- cipher usage
The cipher can be negotiated in advance and may not be part of the message itself, or can be e.g. at the beginning or at the end of the message.
First 3 letter can tell you - use small wheel with the sign "+" (alphabet is clockwise) and set wheels - "3" from big wheel refers to "D" on the small wheel.
Then on the small wheel find other letters from message above a read opposite letters from big wheel.
Rubric and Assessment
Not sure, what sould be here :)