Although the U.S. military stateside can direct a drone aircraft halfway around the world to deliver bombs mostly on highly specific targets in Iraq, the Pentagon acknowledged in December that even after six years of war, its signals to the drone are still not encrypted. Thus, Iraqi insurgents can pinpoint drone locations merely by using ordinary computer programs like SkyGrabber, which is widely available from software retailers for about $25. U.S. officials admitted that the software could make it easier for insurgents to anticipate the timing and location of attacks. [Wall Street Journal, 12-17-09]
Afghanistan and Pakistan continue to be dangerous for blundering insurgents. In January, 14 suspected Taliban terrorists accidentally blew themselves up in Kunduz province while riding a bus carrying bombs to an intended target. And in Karachi, Pakistan, two days later, eight suspected terrorists accidentally blew themselves up while handling bombs in their "safe house." [CNN, 1-6-10] [Voice of America News-AP, 1-8-10]
This whole thing just leaves me speechless. Unencrypted transmissions mean that our own drones would be nigh useless against any enemy with even minimal electronic warfare capacity- and if they had good capacity, they could potentially hijack our own drones, or do any number of nasty things to them.
Of course, we're not exactly fighting braniac, as the second anecdote shows, so hey.
Source:
http://www.newsoftheweird.com/archive/index.html