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Winny (also known as WinNY) is a Japanese peer-to-peer (P2P) file-sharing program which claims to be loosely inspired by the design principles behind the Freenet network, which makes user identities untraceable. While Freenet was implemented in Java, Winny was implemented as a Windows C++ application.〔Hongo, Jun, "(File-sharing: Handle Winny at your own risk )", ''Japan Times'', October 27, 2009, p. 3.〕 The software takes its name from WinMX, where the M and the X are each advanced one letter in the Latin alphabet, to N and Y. According to a 2006 report by the Recording Industry Association of Japan, more than three million people had tried Winny. Like Freenet, each client functions as a node. Initially, a search returns few results, but one can set up "clusters" based on certain keywords, and over time, one's client will learn the best route to obtain the information sought. The software was developed by Isamu Kaneko, who was a research assistant in graduate course of computer engineering at the University of Tokyo in Japan. He was also once a researcher at the (Japan Atomic Energy Research Institute ). Kaneko originally anonymously announced his intent of developing the software on the Download Software board of the popular 2channel (''2ch'' for short) Japanese bulletin board site. Since 2ch users often refer to anonymous users by their post numbers, Kaneko came to be known as "Mr. 47" ("47-Shi", or 47氏 in Japanese), or just "47". Kaneko died on the 6 July 2013 after suffering a heart attack.〔() 〕 After Winny's development stopped, a new peer-to-peer application, Share, was developed by an anonymous Japanese engineer to replace Winny. ==Anonymity== At the time of the two users' arrests, the Kyoto Police claimed to have "analyzed Winny's anonymity features" to track the users down, but did not disclose the exact method used. It later turns out, as the details of the method used were disclosed at Kaneko's first day of trial, that this statement was not entirely accurate — It was areas where Winny did ''not'' provide anonymity that the Police used to track users down. After failing to crack Winny's encrypted communications used in its file sharing feature, the Kyoto Police switched to a different method, namely tracking users via Winny's integrated forum feature. Unlike its file sharing feature, the forum feature of Winny provided anonymity for users who accessed message threads, but not for creators of threads. Users accessing threads were able to determine the IP address of the originator of the thread. The Kyoto Police first looked for a thread where its originator was posting the file names of copyrighted material he was sharing, and recorded his IP address. They then configured their firewall to only allow connections to them from the thread owner's IP address. Finally, they confirmed that they could indeed download the copyrighted file from the user who stated (on his thread) that he was sharing it. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Winny」の詳細全文を読む スポンサード リンク
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