ABSTRACT
In 1999, Napster used firstly file sharing in P2P networks, and brought the concept of file sharing into the mainstream with its wildly popular music-sharing service. Napster enabled tens of millions of users to share MP3-formatted song files. In its place many other file-sharing systems have emerged, driving an endless debate over the impact of music sharing and a string of legal challenges by the music and video content industry. For thwarting file sharing, Firms, universities, and ISPS block or throttle traffic associated with P2P systems using approaches such as port filtering. Client developers responded by using ports associated with other services to exchange data, blending file-sharing traffic with other data streams. The debate and thwarting don’t caused the file sharing to reduce and continues to grow, with usage doubling from less than 4 million in
1 INTRODUCTION
As firms become ever more dependent on information, it will have the very big economic loss once that information is leaked [1]. So information security has become a new focus of the business news. The firms come under increased pressure to harden their networks and take a more aggressive security posture. However, it is often not clear what security initiatives offer firms the great improvement. Through a close look at the media and network, we find that the reasons of information leak are not hacker attacks on the network, but rather the unintentional disclosures information in the process of work [2]. For examples, laptops at Boeing, were lost and stolen, in each case inadvertently disclosing person and business information. Organization has mistakenly posted on the Web many different types of sensitive information, from legal to medical to financial. Even technology firms such as Google and AOL have suffered the embarrassment of inadvertent Web posting of sensitive information. Still other firms have seen their information. In each case, the result was the samesensitive information inadvertently leaked creaking embarrassment and financial loss for the firms [3].
