News for hackers. Stuff that matters.

A comment on NSA Collects 'Word for Word' Every Domestic Communication, Says Former Analyst. Parent comment

Re:NSA Collects 'Word for Word' Every Domestic Communication... by ippisl on Saturday August 03, 2013 @08:26AM (#6151908)
I read some research about provably secure steganography , which claim that if you know the statistics of the communication channel, you can build secure steno, at least to the level one way functions.

So it is interesting if in reality there is a stego detection tool.

www​.cs.umn.edu/~hopper/tc-stego.pdf

Btw one of the authors is Luis von ahn, the founder of duelingo, the language teaching/translation app.

[ Parent | on HN ]
Re:NSA Collects 'Word for Word' Every Domestic Communication... by im3w1l on Saturday August 03, 2013 @10:19AM (#6152130)
> if you know the statistics of the communication channel, you can build secure steno

That's a pretty big if though. I mean, if you miss one nuance the NSA didn't, then your scheme could be toast. At least in the high data limit.

[ Parent | on HN ]
Re:NSA Collects 'Word for Word' Every Domestic Communication... by ippisl on Saturday August 03, 2013 @12:19PM (#6152494)
You're right, that's a very big if.

Also, most of the research in the field has been done on black and white image, so it not directly usefull.

And come to think on it, if we're talking about image stego, what prevents the NSA from controlling the statistical distributions of output of cameras in such a way that stego will be noticed(even after some image transforms) ?

[ Parent | on HN ]
Re:NSA Collects 'Word for Word' Every Domestic Communication... by IsThisObvious on Saturday August 03, 2013 @02:24PM (#6152826)
Maybe the answer is to have a program that adds low scale random noise to as many images as it can before upload to the internet.

It would be easy enough to make a one-click batch process, and would help provide cover noise for real communication channels.

[ Parent | on HN ]
Re:NSA Collects 'Word for Word' Every Domestic Communication... by zeckalpha on Saturday August 03, 2013 @11:24AM (#6152345)
Also, this group invented the CAPTCHA.
[ Parent | on HN ]