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Many interesting ones in this list. I like the Kryptos at the CIA headquarters. 

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 post is about cracking the vigenere cipher. It also uses computer programming to solve it which I found interesting.

I found this interesting because it mentions the fact that there may have been a revision to the Beale cipher before it was published.

Example of how improving technology requires new encryption that hasn't yet been cracked

I'm just going to resubmit the bookmark directly to this page so I'll be sure it ends up publicly in the group. This wasn't mentioned in Singh chapter 2, but it was created around the time period discussed in the chapter. (Plus, it's one of my favorite articles I've read in Wired so I really wanted to use it as a bookmark.) The article discusses the strategies used to break this cipher, some of which, such as frequency analysis, we have talked about in class. It's also just fascinating to read about the Oculists and their history.

some extension about Marry Queen of Scots and cipher

A basic overview of the Siemens T-43 cipher machine used by the Germans, the first mixer machine of its kind.

The Babington plot, which was the undoing of Mary, Queen of Scots, was one of several conspiracies against Elizabeth I that were uncovered. The Ridolfi Plot In 1571 a plot was discovered involving Philip II of Spain, Pope Pius V and the Duke of Norfolk, as well as Mary's advisor, the Bishop of Ross, and Mary herself.

Here's the Prezi I shared today on the Vigenere cipher.

This is a cryptography blogger's translation of Kerckhoff's article about military cryptography. He denotes that secret methods of communication are limited to higher officers due to potential leakage; but by limiting cryptographic use, are they potentially putting at risk the safety of lesser positions in order to keep the secrecy of their cipher methods? Is this just the inevitable nature of cryptography in general?

This article describes how, during the Cold War, the major distributor of cryptography machines (Crypto AG) worked with the NSA. This professional relationship provided the NSA with shortcuts on how to break ciphers created from the different machines. Also, Crypto AG was revealed as not having given the most up to date models to all countries, probably through deception. This raises the question of morality involving basic warfare. How is it moral for this supposedly trusted third party company to have special allegiances with the United States?Would the United States have the same opinion on this actions morality if they were the ones being sold out of date equipment? Or if one of their opponents had shortcuts?

Describes the personal relationship between President Abraham Lincoln and those who encoded military telegraph messages during the Civil War

Interesting article that shows how even though we think we're very advanced at cryptography, sometimes an old and outdated technique slips through the cracks in our defenses.