crypto

Entropy Story-time: From Claude Shannon to Equifax

Mix Two Colors / Pietro Jeng

There's an piece floating around that does a great, succinct job at summarizing Claude Shannon's contributions to our modern understanding of information. If you haven't read The bit bomb on Aeon, head over there. It'll make your brain happy with things like this:

"Shannon – mathematician, American, jazz fanatic, juggling enthusiast – is the founder of information theory, and the architect of our digital world. It was Shannon’s paper ‘A Mathematical Theory of Communication’ (1948) that introduced the bit, an objective measure of how much information a message contains."

The article digs deep into how easy it is to predict things - especially language. It ends up focusing on the power of pattern detection in being able to compress information:

"Shannon expanded this point by turning to a pulpy Raymond Chandler detective story […] He flipped to a random passage … then read out letter by letter to his wife, Betty. Her role was to guess each subsequent letter […] Betty’s job grew progressively easier as context accumulated […] a phrase beginning ‘a small oblong reading lamp on the’ is very likely to be followed by one of two letters: D, or Betty’s first guess, T (presumably for ‘table’). In a zero-redundancy language using our alphabet, Betty would have had only a 1-in-26 chance of guessing correctly; in our language, by contrast, her odds were closer to 1-in-2. "

A Recent History of Back Doored Encryption, in 4 links

TSA Keys, 3D-printed

This is partially a footnotes section from last week's Crpyto Saves Lives post, but every week brings new stories, and this week was a doozy. So, let's recap the whole "backdoored crypto / secret golden keys can work" argument:

Claims:

(1) We can protect private information

*Cough* OPM *Cough*

Update: "Security bloggers and researchers claim to have uncovered a publicly available database exposing the personal information of 191 million voters on the Internet. The information contains voters’ names, home addresses, voter IDs, phone numbers and date of birth, as well as political affiliations and a detailed voting history since 2000."

(2) Well, we are really good at protecting super-important crypto keys that only give good guys access,

So, those luggage locks with a "golden key", now required world-wide that only trained TSA agents can pop open? Yeah, about that... - TSA's master key set was allowed to be photographed, and while that photo was quickly taken off the internet, the damage was done. Anyone can now 3D print completely functional TSA keys.

(3) Besides, adding a backdoor won't cause problems!

Tags

Encryption saves lives

There are many great arguments to protect truly private communications from a human rights perspective, and specifically through a Constitutional lens -- restoring the privacy of having a conversation in your living room and having your personal records stay personal are core first and fourth amendment rights which have suffered greatly in the digital age.

My work takes me around the world to support journalists, human rights activists, and a wide variety of amazing people working to improve the world. They are all facing incredible threats posed by powerful actors. These adversaries use malware, hacking, and all forms of digital attacks to compromise the networks of activists.

Open source, trusted, strong cryptographic tools -- and increasingly, trusted commercial systems such as Google's -- are their only available defense, in situations where failure can include targeted harassment, indefinite imprisonment, torture, and even death.

Encryption saves lives.