Ebook: Codes, Ciphers and Secret Writing

""A fascinating, challenging book.""--A.L.A. Booklist . Experiment with cryptography - the science of secret writing. Cipher and decipher codes: transposition and polyalphabetical ciphers, famous codes, typewriter and telephone codes, codes that use playing cards, knots, and swizzle sticks ... even invisible writing and sending messages through outer space. Hours of intrigue and challenge. 45 diagrams.;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.