firewall definition and reviews

1. Introduction

• A firewall is a system or group of systems that enforces an access control policy between networks
• Mostly the goal is to protect TCP/IP networks
• Other possible firewalls: between applications on a windows environment, java card firewalls, etc.
• Functions:

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Understanding Viruses And Comrades (Virus Variants)

1. Understanding Computer Viruses
   A computer virus is a computer program that duplicate or replicate by inserting a copy or copies of itself into the storage media / documents and into the network secretly without the knowledge of computer users. The effects of computer viruses are very diverse ranging from only appear strange messages to damage the computer and delete files or documents we.
2.  Worm virus Varian Definition, Trojan and Spyware

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Trojan horse tutorial

Trojan horse or Trunyan horse (Troy) , or better known as a Trojan in the computer security refers to a form of suspicious software (malicious software / malware) that can damage a system or network. The purpose of the Trojan was to obtain information  from the target (passwords, user habits recorded in the system log, data, etc.), and control target (gain privileges on the target).

Trojan different from  other  types of  suspicious software such as computer viruses or worms. because Trojan has the following properties:

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