In today's society, Internet technology is widely used. According Internet service provider Netcraft [1], in December 2011 there was 555,482,744 websites, which is an increase of 5.6%, 175 million of which were active. The main indicator of the quality of Internet service is safety and reliability. Based on the evaluation of vulnerability assessment analyzes performed by management service provider WhiteHat Security [2] only 16% of websites were not vulnerable during the year 2010. WebCohort, Inc. studies [3] indicate that at least 92% of web applications are vulnerable to an attack of some kind.
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