Codes, Ciphers and Secret Writing by Gardner, Martin -- Read -- Imperial Library of Trantor

Index

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 Cipher Grilles 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 Cranks Interplanetary Communication

Back Cover

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