INTRODUCTION:
The Internet or the
global Internet is the internationally connected network of computer networks
with addresses that are administrated by IANA (Internet address and Naming
Authority). It grew dramatically because
anyone can connect to it and any one connected to it can connect others to it
as well. Each site that connected to it, can become an Internet Service
provider to other sites.The features that give Internet its vitality also make
it unsafe, like streets of a major city.
People do not walk carelessly in vital, teeming city.
A careful person
approaches the Internet with caution.The essential problem is that you can make
no assumptions about data you send in, receive over the Internet. Data you send
could be modified by subverted routing host before it arrives at its
destination. The data could be stolen
and resorted to a different destination, never arriving where it should. Data
youreceive could be , completely forged (or) simply modified in transit. If
your data is important then there is a real risk of someone interfering with
it, then you need, protection.Thus, business data that crosses the public
Internet can be forged, modified and stolen.
Cryptography has
emerged as the only alternative to protect Internet data and it does the job
well. Modern crypto techniques have evolved from secret codes of decades past,
brilliantly augmented with deep knowledge of modern mathematics. New cryptographic products and technologies
have been developed particularly for Internet applications.
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