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INTRODUCTION

Cryptography is the science of writing in secret code and is an ancient art; the first documented use of cryptography in writing dates back to circa 1900 B.C. when an Egyptian scribe used non-standard hieroglyphs in an inscription. Some experts argue that cryptography appeared spontaneously sometime after writing was invented, with applications ranging from diplomatic missives to war-time battle plans. It is no surprise, then, that new forms of cryptography came soon after the widespread development of computer communications. In data and telecommunications, cryptography is necessary when communicating over any untrusted medium, which includes just about any network, particularly the Internet.

The Internet is a big place with a lot of people on it. It is very easy for someone who has access to the computers or networks through which someone information is traveling to capture this information and read it; this could cause threat such as: identity theft, message modification, false messages, message replay, unprotected backups and repudiation.


  

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