Codes, Ciphers and Secret Writing

Content: Cover Page
 Title Page
 Copyright Page
 Contents
 Introduction
 1 Easy Transposition Ciphers
 The Rail Fence Cipher
 The Twisted Path Cipher
 Scrambling with a Key Word
 2 Easy Substitution Ciphers
 Shift Ciphers
 Date Shift Ciphers
 Key Word Ciphers
 The Pigpen Cipher
 The Polybius Checkerboard
 Random Substitution Ciphers
 The Shadow's Code
 3 How to Break Substitution Ciphers
 4 Hard-to-break Polyalphabetic Ciphers
 Porta's Digraphic Cipher
 The Playfair Cipher
 Lewis Carroll's Vigenère Cipher
 5 Simple Code Machines
 Typewriter Codes
 A Telephone Dial Code
 The Scytale
 The Alberti Disk. Thomas Jefferson's Wheel CipherGrilles
 The Triangle Code
 6 Invisible Writing
 Inks That Develop When Heated
 An Ink That Turns Red
 Inks That Glow in Blacklight
 Inks That Appear When Powdered
 Writing That Becomes Visible When the Sheet Is Wet
 Writing That Can Be Seen in Slanting Light
 Typing That Can Be Seen in Raking Light
 7 Bizarre Methods of Message Sending
 The Dot Code
 The Knot Code
 The Playing Card Code
 The Red-Blue Code
 The Crayon Cover
 The Crease Code
 The Swizzle Stick Code
 8 Codes for Other Worlds
 References for Further Reading
 Historical
 Methods
 Codebreaking. Cipher CranksInterplanetary Communication
 Back Cover.