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Vanish (computer science)
Vanish is a project at the University of Washington which endeavors to "give users control over the lifetime of personal data stored on the web."〔(【引用サイトリンク】title=' This article will self-destruct: A tool to make online personal data vanish )〕 The project proposes to allow a user to enter information that he or she will send out across the internet, thereby relinquishing control of it. However, the user is able to include an "expiration date," after which the information is no longer usable by anyone who may have a copy of it, even the creator.〔(【引用サイトリンク】 'Privacy Tool Makes Internet Postings Vanish ' )〕 The Vanish approach was found to be vulnerable to a Sybil attack, and thus insecure, by a team called Unvanish from the University of Texas, University of Michigan, and Princeton.
==Theory==
Vanish acts by automating the encryption of information entered by the user with an encryption key that is unknown to the user. Along with the actual information the user enters, he or she also enters metadata concerning how long the information should remain available. The system then encrypts the information, but does not store either the encryption key or the, instead breaking up the decryption key into smaller components that are disseminated across distributed hash tables, or DHTs via the internet. The DHTs refresh information within their nodes on a set schedule unless told to persist the information. The time-delay entered by the user in the metadata controls how long the DHTs should allow the information to persist, but once that time period is over, the DHTs will reuse those nodes, making the information about the decryption stored irretrievable. As long as the decryption key may be reassembled from the DHTs, the information is retrievable. However, the time initially entered by the user has lapsed, the information is not recoverable, as the user was never informed of the decryption key.〔(【引用サイトリンク】title=' Vanish: Increasing Data Privacy with Self-Destructing Data )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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