1. Computers store large amount of data in tiny space: Let see a CD ROM, it can store an emormouse information.
2. Computer is accessible: as we have heard nowadays the strongest of firewall authentication systems still have been cracked.
3. Computer is complex: the complexity of computers allow hackers exploiting and gain what they want. There are always weaknesses or flaws for the criminal to breach the system. Even the weaknesses have been patched up, but the hackers will then find another flaw to exploit and the cycle goes on and on. So designing a great security operating system is very crucial.
4. Human error: people leave careless specifying their password for a system, their use a guessable password.
reference: http://www.bezaspeaks.com/cybercrime/whyit.htm
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