Information and Systems Security

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Network Security is one of the most highly debated topics in the present day world. Network Security has many dimensions. Securing any network is like securing a country's access points with several defense mechanisms. Network Security has become a very essential part of each and every network present on this planet- be it the Internet which we use or the LANs (Local Area Networks) and MANs (Metro Area Networks).


But with this ease of information access comes the issue of security. With the increase of information flow, there has been an increase in the number of attacks on information by hackers. Attacks such as Denial of Service (DoS) Attacks, Spoofs, Sniffing, etc. have increased with the increase in the availability of hacking tools which are free of cost. Valuable information is lost in the process. For example, if a customer buys a product of a particular organization through their web-site and a hacker presents himself as the organization and receives the money from the customer, valuable information such as the ID of the customer, his credit card numbers, his passwords are all stolen by the hacker. Therefore such information has to be transferred securely over the Internet. Encryption is the most common way of securing valuable information while transmitting over the Internet (Rahman, 2003). Networks are secured in a different manner. They are secured using tools called "Firewalls". Whenever transactions or information between a customer and an organization are being carried out, a particular pattern is followed. ...
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