Ink Stamp : Codes - Pig Pen Key Plate Generator

Pig Pen key plate Generator by Ty Harness 15/11/18

The Pig pen geometry is easy to remember therefore you would never need to keep a hard copy of the key. When both Bob and Alice have decided on and memorised the geometry. Any copy left printed would compromise the code's use.

But you could mix up the letters in the pens with a Caesar cipher. But
then how does both Alice and Bob know which letters go in which pens without seeing the key written down and the ciphor loses its ease of u