3.CRYPTOGRAPHY & NETWORK SECURITY

3.CRYPTOGRAPHY & NETWORK SECURITY - PAPER PRESENTED...

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PAPER PRESENTED BY: N.BHARGAVI M.V.S.SRAVANI Regd.No:Y5CS814 Regd.No:Y5IT883 III/IV B.TECH III/IV B.TECH EMAIL : bhargavionline2006@yahoo.com EMAIL:sraonline2006@yahoo.com (Affiliated to Acharya Nagarjuna University) Chandramoulipuram Chowdavram GUNTUR - 19 1
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CONTENTS What is Cryptography? Types of Cryptography 1. Secret (symmetric) Key Cryptography. 2. Public (asymmetric) Key Cryptography. 3. Hash Functions. 4. Trust Models. Today’s latest used cryptographic techniques Different types of threats to network Network Security can be done by various methods 1. VPN ( Virtual Private Networks) 2. Firewalls 3. IPSec. 4. AAA Server. Abstract Network security is a complicated subject, historically only tackled by well-trained and experienced experts. However, as more and more people become ``wired'', an increasing number of people need to understand the basics of security in a networked world. This document was written with the basic computer user and information systems manager in mind, explaining the concepts needed to read through the hype in the marketplace and understand risks and how to deal with them. Some history of networking is included, as well as an introduction to TCP/IP and internetworking . We go on to consider risk management, network threats, firewalls, and more special-purpose secure networking devices. This is not intended to be a ``frequently asked questions'' reference, nor is it a ``hands-on'' document describing how to accomplish specific functionality. It is hoped that the reader will have a wider perspective on security in general, and better understand how to reduce and manage risk personally, at home, and in the workplace. 2
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Cryptography and Network Security Does security provide some very basic protections that we are naive to believe that we don't need? During this time when the Internet provides essential communication between tens of millions of people and is being increasingly used as a tool for commerce, security becomes a tremendously important issue to deal with. There are many aspects to security and many applications, Ranging from secure commerce and payments to private Communications and protecting passwords. One essential aspect for Secure communications is that of cryptography . 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. In data and telecommunications, cryptography is necessary when communicating over any untrusted medium, which includes just about any network, particularly the Internet. Within the context of any application-to-application communication, there
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3.CRYPTOGRAPHY & NETWORK SECURITY - PAPER PRESENTED...

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