[mclehman]

Sections like this too:

>DHKE was one of the first public-key protocols, which allows two parties to exchange data securely, so that is someone sniffs the communication between the parties, the information exchanged can be revealed.

I don't think that information being revealed through passive observation is a selling point of DHKE.

[celticninja]

The point they are trying to make is that you can sniff the exchanged information during key setup, but knowing this does nothing for the attacker. That information is not required to be secret. So " the information exchanged can be revealed." means 'it can be revealed without concern for security of the key generated by the process'. The author doesnt mean that the eventual messages will be revealed.