Securing computers had been an issue since the development of computers. As number of people using computers increased, securing computer resources and also the computer network had become an ongoing task to be achieved. Linux operating system is taking a leading step in computer security. In this document I am going to discuss about three key topics related to computer security and Linux security. They are as stated below:
1) What is Computer Security?
2) Best practices in Linux Security
3) Linux Security Vs Windows Security
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ATTACKS USING IP SPOOFING

IP-spoofing is complex technical attack that is made up of several components. In actuality, IP-spoofing is not the attack, but a step in the attack. The attack is actually trust-relationship exploitation.

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What is a firewall?

a firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy. A firewall has the basic task of controlling traffic between different zones of trust. Typical zones of trust include the Internet (a zone with no trust) and an Internal Zone (a zone with high trust). The ultimate goal is to provide controlled connectivity between zones of differing trust levels through the enforcement of a security policy and connectivity model based on the least privilege principle. It requires considerable understanding of network protocols and of computer security.

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