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Ciphers and Codes
Karen Price Hossell
出版
Heinemann Library
, 2003
主題
Juvenile Nonfiction / General
Juvenile Nonfiction / Games & Activities / General
Juvenile Nonfiction / Games & Activities / Puzzles
Juvenile Nonfiction / Language Arts / General
Language Arts & Disciplines / Communication Studies
ISBN
1588104842
9781588104847
URL
http://books.google.com.hk/books?id=4gYJ2yknmV8C&hl=&source=gbs_api
註釋
Learn about ciphers and codes--the tools used to keep a message secret. See how ciphers were used by the patriots in the American Revolutionary War. Find out how to make your own cipher. In this book, you will discover how flag signals and smoke signals work, see how computers use ciphers and codes today, find out how you can break a cipher without a key.