A puzzlebook for anyone with a love for ciphers and cryptography. This third volume contains Pen ciphers (also known as Masonic ciphers) and Polybius ciphers, two of the many varieties of mono-alphabetic substitution ciphers (MASC's). These are more advanced than your standard cryptograms and much more fun to solve! Each puzzle is rated Easy, Moderate, or Difficult and contains a gem of Stoic wisdom. The puzzlebook comes compete with a brief chapter on the history of ciphers, a detailed set of instructions, as well as sections offering both hints and full solutions to the encrypted puzzles. Enjoy cipher solvers!
