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Project website for Vanish: “Vanish is a research system designed to give users control over the lifetime of personal data stored on the web or in the cloud. Specifically, all copies of Vanish encrypted data — even archived or cached copies — will become permanently unreadable at a specific time, without any action on the part of the user or any third party or centralized service.”
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Article on U. of Washington prototype that uses a peer-to-peer encryption technique that makes messages disappear over time.