This article on how the CIA is using crowdsourcing to make intelligence more accurate is particularly well written because if its inclusion of a quick attention draw with the reference to the new James Bond movie, good historical background, an inviting writing style that includes rhetorical questions, and interviews with experts that add to the legitimacy of the article.
This article talks about the want for greater government surveillance after the Paris attacks. It mentions that since Edward Snowden released information about the NSA's digital surveillance power, a lot of measures have been taken to restrict government surveillance. However, since the Paris attacks, the US government is pushing to bring that power back.
Here's a list of 10 unsolved cipher texts throughout history, #2 is the Beale Papers covered in the chapter, #8 is Kryptos (the background of our website). Some date back as far as 1400 BC and some are more recent like the Zodiac Killer.
This article discusses the faults in former deputy director of the CIA Michael Morell's statement that the use of encrypted apps made it difficult to stop terrorists. Claims that encrypted communications put them out of reach was false - there had been no change in al Qaeda tactics. Also, author Howard points out that there isn't a clear dichotomy between privacy and security.