nowadays cyber criminals seem to be everywhere, with a few clicks, committing all kinds of cyber crimes. to illustrate, some commit fraud or lift intellectual property. others subvert deals, snatch passwords or disrupt e-commerce. still others unleash viruses to crash computers. as a result, these hackers do a great damage to companies and computer users, causing computer losses up to 10 billion dollars per year.

　　naturally,there are many causes for the cyber crimes. in addition to the wicked nature of the hackers, the fraihies of internet partially nourish the crimes. just because there are holes in internet, the complex software is buggy and often infested, the cyber vandals can find out the weakness in the website software programs and iv manipulating software glitches, gain access to website, committing all kinds of crimes.

　　however, we shouldn`t tolerate these cyber criminals any more. and it`s high time for us to take all the effective steps to battle the cyber crooks. first we should reinforce the cyber laws to protect the web, the powerful engine of economy. besides,we should use high techniques to improve intrusion detection, encrypfion and computer security. finally, we should train more talented people to build up more firewalls so as to make the net immune to all kinds of viruses and unalienable to all kinds of cyber criminals.

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