Pigpen Cipher

Substitution ciphers can vary widely.

Some substitution ciphers use geometric symbols rather than letters or numbers. For example, the classic pigpen cipher has ciphertext that looks like some alien language.

This is a geometric substitution cipher that replaces letters with fragments of a grid. To make the key, create two “tic-tac-toe” grids and two “x” grids. One with dots and without…