Even if this method was applicable to the algorithms used by bitcoin it is a much less significant threat then what we already know exists out there.  For instance the back doors available to NSA employees built into the Mac and Windows operating systems.  Couple that with the fact that it has been revealed that NSA employees, even those without security clearance, have had free reign to use communication spytools for personal use, spying on the spouse suspected of cheating, stalking the love interest etc...  Take that knowledge and look at the Mac/Windows downloads vs the linux downloads for bitcoin-qt: http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.8.6/