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Forward secrecy is a cryptographic property of a protocol ensuring that future compromise of a long-term key (e.g. private keys in TLS) will not allow the adversary to compromise the short-term (session) key and decrypt past communications. Unless the adversary uses the Man-in-the-Middle attack, past communications will be unbreakable for protocols possessing the property.

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Tom has provided a good explanation as to why Diffie-Hellman cannot be safe against man-in-the-middling. Now this answers the OP's original question but probably leaves some readers with the (reasonab …
answered Jun 15 '15 by zinfandel