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Google Online Security Blog: Protecting data for the long term with forward secrecy

 

Most major sites supporting HTTPS operate in a non-forward secret fashion, which runs the risk of retrospective decryption. In other words, an encrypted, unreadable email could be recorded while being delivered to your computer today. In ten years time, when computers are much faster, an adversary could break the server private key and retrospectively decrypt today’s email traffic.

Google Online Security Blog: Protecting data for the long term with forward secrecy