Chapter XVIII. Cryptographs and CrrrTEKS.

Authorities
Cryptographs. Definition. Illustration . Ciphers. Definition. Illustration Essential Features of Cryptographs and Ciphers Cryptographs of Three Types ....
Transposition Type. The Eoute Method
Use of non-significant symbols. The Grille
Use of broken symbols. The Scytale . Ciphers. Use of arbitrary symbols unnecessary Ciphers of Four Types
Substitution Alphabets. Illustrations .
Conrad's Tables of Frequency
Ciphers of the Second Type. Illustrations
Shifting Alphabets. Illustrations .
Gronfeld's and the St Cyr Methods
The Playfair Cipher ....
Ciphers of the Fourth Type. Illustrations Desiderata in a good Cipher or Cryptograph .
Cipher Machines
On the Solution of Cryptographs and Ciphers
Example
Historical Ciphers
Julius Caesar, Augustus, Bacon, Morse Cod
Charles I
Pepys
De Kohan, Marie Antoinette .
The Five Digit Code Dictionary .
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