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An encrypted VPN, with the user having to key in a password, could take care of this. If the software is done right, you'd have to have possession of the physical machine AND know a password in order to learn how to forge the IP address.

It all depends on the threat(s) against which you wish to protect yourself. If it is one of authentication of the sender, you really do not care about the IP address, since the reporter, especially one who travels a lot, may change IP address a lot and frequently. It suffices to use a good digital signature, as I suggested earlier today.

If it is to guard against interception of the message(s), a public key encryption scheme, as I also suggested earlier today. I am not sure if the NSA could crack any of this, but it is secure enough that they would not bother to try except in exceptional cases. I think it would be easier to just send in the CIA and have them use extreme measures to extract the passphrase from the unfortunate reporter. Or use quasi-legal methods on the publishers at the other end to divulge the content of the messages.

Sure, set up a VPN, but how does it work? No doubt it uses public key encryption too. It has been known how to do this for years, and open source software to do it has been around for almost 10 years. Zimmerman's work on Pretty Good Privacy has been around almost 20 years. One would think the New York Times would not be 20 years behind the times, but I guess they are. Maybe Julian Assange could consult with them about this, but they would need to assure him he would not be captured and put do death were he to come to the USA.
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