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Perfect forward secrecy

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Original author: 
Joshua Kopstein

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Demand for encryption apps has increased dramatically ever since the exposure of massive internet surveillance programs run by US and UK intelligence agencies. Now Facebook is reportedly moving to implement a strong, decades-old encryption technique that's been largely avoided by the online services that need it most.

Forward secrecy (sometimes called "perfect forward secrecy") is a way of encrypting internet traffic — the connection between a website and your browser — so that it's harder for a third party to intercept the pages being viewed, even if the server's key becomes compromised. It's been lauded by cryptography experts since its creation in the early 1990's, yet most "secure" online services like banks and webmail still...

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