| ▲ | amenhotep 4 days ago | |
That's not a requirement. Pigpen is a substitution cipher. | ||
| ▲ | JdeBP 3 days ago | parent [-] | |
You will find that the pigpen cipher has a 1:1 mapping between its input alphabet and its output alphabet, and that a 1:1 mapping is a necessity for full invertibility. | ||