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Cryptography and Network Security by S. Bose, Ajay Kumar

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Chapter 1

Cryptography

1.1 Overview of Cryptography

The term ‘cryptography’ is derived from two Greek words, namely crypto and graphy. In Greek language, crypto means secret and graphy means writing. Cryptography is the science of secret ­writing that provides various techniques to protect information that is present in an unreadable format. This ­unreadable format can be converted into readable format only by the intended recipients. ­Advanced cryptography provides various techniques based on number theoretic approach and computer ­science and hence advanced cryptography techniques are virtually unbreakable. This book discusses about ­various cryptographic and advanced cryptographic techniques. Cryptographic techniques and ­protocols are ...

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