Secret Key Cryptography

Appendix A. Fun pages

There are four separate ciphers in this diagram, S1 to S4. Each cipher is a simple monoalphabetic substitution. Your job is to identify the type, such as Morse code, and then solve it. Each cipher is written in standard English, using uppercase letters without spaces or punctuation. Each cipher is between 75 and 90 letters long. All begin in the upper-left cell. The first 3 ciphers read left to right across the rows. The last cipher reads clockwise around the border.

The methods are all described in this book. The only difference is the visual presentation. You need to determine which features are relevant in each cipher, ...