Focusing on the consequences of the Patriot Act and how the US government upped the security on civilians after 9/11, this is a really nice graphic that gives a scary visual on the expanded powers of the national government in the name of security. It's from the ACLU, so this gives a pretty good perspective of, specifically, curbed liberties.
This blog has information about military cryptography and privacy in general, including this post about the Zimmermann Telegram. Is it ethical to lie to an ally if it is in their best interest? What are the ethics behind spying on one's allies? Do ethics hinder one's ability to win a war, and if so, should ethics be disregarded in times of war? Another interesting post examines how Snowden should be viewed as a patriot, not a traitor. This made me question where one's loyalty should remain- to the government or to the people?