You can use Qualys's tool to check any HTTPS site for perfectforwardsecrecy here.
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Every modern browser is capable of initiating perfectforwardsecrecy with a compatible HTTPS-encrypted site.
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In authoritarian countries that have tighter, more repressive surveillance of the internet, the need for perfectforwardsecrecy is even greater.
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Amazon, Etsy, and most popular e-commerce sites, for instance, are equipped to use modes of encryption that include perfectforwardsecrecy.
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More Than Messages But while practically every modern encrypted messaging app uses perfectforwardsecrecy, its integration into web encryption has been far spottier.
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OTR has another property, called PerfectForwardSecrecy.
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With PerfectForwardSecrecy, new encryption keys are created for every session, so that even if one is broken, it's only broken that one time.