Download E-books Codes, Ciphers and Secret Writing (Dover Children's Activity Books) PDF

By Martin Gardner

"A interesting, difficult book." ― A.L.A. Booklist
Learn to take advantage of an important codes and techniques of mystery communique in use when you consider that precedent days. Cipher and decipher codes utilized by spies. discover the recognized codes that modified the destiny of countries and political leaders. and revel in hours of enjoyable experimenting with cryptography ― the technological know-how of mystery writing.
Beginning with basic letter substitutions and transposition ciphers, world-famous technological know-how author Martin Gardner explains how you can holiday complex polyalphabetical ciphers and codes labored with grids, squares, triangles, and charts. you are going to research codes which are keyed to typewriters and phone dials . . . even codes that use cards, knots, and swizzle sticks. scan with invisible writing ― inks that glow in black mild and switch pink lower than warmth ― and discover the chances of sending messages via outer house to unknown worlds.
Using this booklet, you could resolve the traditionally recognized Playfair Cipher utilized by Australia in international warfare II, the Pigpen Cipher utilized by accomplice squaddies throughout the Civil warfare, Thomas Jefferson's Wheel Cipher, the Beaufort method utilized by the British Royal army, codes devised through authors for heroes in literature ― Sherlock Holmes, Captain Kidd, and the Shadow. and you may take pleasure in experimenting with extraordinary tools of message sending ― the Dot Code, Knot Code, Swizzle Code, and extra.
Young cryptanalysts, cipher lovers, and puzzlists of every age will locate hours of intrigue and problem in Codes, Ciphers and mystery Writing.
"A stimulating needs to for the intermediate cryptographer." ― The Kirkus Reviews

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