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Evercookie is a JavaScript-based application created by Samy Kamkar which produces zombie cookies in a web browser that are intentionally difficult to delete. In 2013, a top-secret NSA document was leaked by Edward Snowden citing Evercookie as a method of tracking Tor users. ==Background== A traditional HTTP cookie is a relatively small amount of textual data that is stored by the user's browser. Cookies can be used to save preferences and login session information; however, they can also be employed to track users for marketing purposes. Due to concerns over privacy, all major browsers include mechanisms for deleting and/or refusing to accept cookies from websites. The size restrictions, likelihood of eventual deletion, and simple textual nature of traditional cookies motivated Adobe Systems to add the Local Shared Object (LSO) mechanism to the Adobe Flash player. While Adobe has published a mechanism for deleting LSO cookies (which can store 100 KB of data per website, by default), it has met with some criticism from security and privacy experts. Since version 4, Firefox has treated LSO cookies the same way as traditional HTTP cookies, so they can be deleted together. 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「Evercookie」の詳細全文を読む スポンサード リンク
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