Codes ciphers and secret writing pdf

Introduction This is a very nice little book on ciphers and secret writings that one can work though to get some exposure to the ways that people might encrypt messages to prevent others from reading them. The book is designed to be read by "children" but I expect that many adults will find it an enjoyable read. In that it presents simple and entertaining methods to encode and decode messages. Information about this book can be found here. The first section of the book deals with encryption and decryption techniques that are used to make directly reading of the encoded message impossible.

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When you were a kid, did you have a "Captain Midnight" decoder ring? With it, you could send messages to a friends that no one else could read. Or perhaps you remember using special symbols to write notes to your "squeeze" in class. If the note was intercepted , your teacher, could learn nothing about your romance. In more serious uses, codes and ciphers are used by our military and diplomatic forces to keep confidential information from unauthorized eyes. Businesses also send data that has been encoded to try and protect trade secrets and back-room deals.