Codes and Ciphers

✍ Collins (Firm : London, England) 📂 Library 📅 2013;2014 🏛 HarperCollins Publishers;Collins 🌐 English

All you need to know about making and breaking codes. Gem Codes and Ciphers touches on everything from the smoke signals used by Native American Indians to encryption devices used by government agencies and the military. Not only does this handy, pocket-sized book cover the history of the developmen

Codes and Ciphers

📁 Codes and Ciphers

✍ Collins, U K 📂 Library 📅 2013 🏛 HarperCollins Publishers 🌐 English

All you need to know about making and breaking codes. Gem Codes and Ciphers touches on everything from the smoke signals used by Native American Indians to encryption devices used by government agencies and the military. Not only does this handy, pocket-sized book cover the history of the developmen

Spy Codes and Ciphers

📁 Spy Codes and Ciphers

✍ Susan K. Mitchell 📂 Library 📅 2013 🏛 Enslow Publishers, Inc. 🌐 English

<p>Can flashing lights send out a secret message? Did a famous spy use sketches of butterflies to hide messages? Can a digital photo hide a secret code? For centuries, spies have used many different ways to pass secret information. Codes and ciphers keep information safe from the enemy. Author Susan

Codes, Ciphers and Secret Writing

📁 Codes, Ciphers and Secret Writing

✍ Martin Gardner 📂 Library 📅 1984 🏛 Dover Publications 🌐 English

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.

Codes, ciphers, and secret writing

📁 Codes, ciphers, and secret writing

✍ Martin Gardner 📂 Library 📅 1972 🏛 Simon & Schuster 🌐 English

Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.

Codes, Ciphers, and Secret Languages

📁 Codes, Ciphers, and Secret Languages

✍ Fred B. Wrixon 📂 Library 📅 1989 🏛 Random House Value Publishing 🌐 English