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How does Perfect forward secrecy work in https? How to check whether it is enabled or not? Which big site actually use this? Paypal? Facebook? Amazon?

I have read this Wikipedia article, but I don't know how it is applied in ssl. http://en.wikipedia.org/wiki/Perfect_forward_secrecy What are the weaknesses of this? How can it be broken?

marked as duplicate by Adi, Xander, TildalWave, NULLZ, user10211 Jun 17 '13 at 10:43

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