gotta side with your friend on this one. you could have a 200 character password and the nsa could still break in ezpz. heck they can even break into a computer thats turned off. here are some links just to touch the tip of the iceberg

http://www.nytimes.com/2014/01/15/us/nsa-effort-pries-open-computers-not-connected-to-internet.html?_r=0

http://www.youtube.com/watch?v=vILAlhwUgIU

http://news.softpedia.com/news/Secret-3G-Radio-in-Every-Intel-vPro-CPU-Could-Steal-Your-Ideas-at-Any-Time-385194.shtml

However a piece of tape over the camera is simple and foolproof.