Well I don't know if that would necessarily prove anything, since in this scenario, microsoft and the nsa are working closely enough together to modify one of t

Well I don't know if that would necessarily prove anything, since in this scenario, microsoft and the nsa are working closely enough together to modify one of their drivers. In that case, couldn't the point of contact at microsoft simply send the message to the nsa to have it signed, and then show it as proof that the key is owned by microsoft?