"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.
| ISBN: | 9780486247618 |
| Publication date: | 28th March 2003 |
| Author: | Martin Gardner |
| Publisher: | Dover Publications an imprint of Dover Publications Inc. |
| Format: | Paperback |
| Pagination: | 96 pages |
| Series: | Dover Children's Activity Books |