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Re: Decrypting an ssh session knowing the private key?

Subject: Re: Decrypting an ssh session knowing the private key?
Date: Fri, 6 Oct 2006 12:03:57 -0600
I would like to write a program that could deycrypt ssh communication
by using the private key of the server computer. This should be
possable right?

I don't believe that is the case.  SSH uses its private key only to
certify its identity to the client.  So knowing the private key lets
you do a monkey in the middle attack, but not to decrypt a captured
stream.

Keying material is derived using the Diffie-Hellman algorithm, which
uses randomly generated secrets at both ends.  You'd have to know the
transient Diffie-Hellman secret used by either the server or client.

Regards
Mark

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