31–40 of 92 posts
Perhaps this could lead to a new kind of captcha that only bots can solve. I doubt it would be efficient, though.
What (if anything) is this saying about the quality of the OCR process? Especially since none of these seem human readable.
Earlier quoted context omitted.
Correct me if I'm wrong here, but that just seems like reinventing crypto with a large key, and requires you to implement a counterparty-provided algorithm, which could be malicious.
The point of steganoraphy is that no realizes there's a message.
This is similar to the project where images of clouds were fed to face recognition software: http://ssbkyh.com/works/cloud_face/
Perhaps this could lead to a new kind of captcha that only bots can solve. I doubt it would be efficient, though.
Not strictly related, but reminded me of the exercise in genetic programming by Roger Alsing: http://rogeralsing.com/2008/12/07/genetic-programming-evolut... It's a rather cool attempt to draw the Mona Lisa using random, semi-transparent polygons
Edit: Roger Alsing's implementation was a single entity population (mutated then reverted if the mutation was no good). I copied this approach in my first implementation, but found that much better results could be achieved with a breeding population of genes.
Earlier quoted context omitted.
The point of steganoraphy is that no realizes there's a message.
And? It still has key sizes, the enemy still knows the system.
There was that Russian Spy who was transmitting data for years on her Facebook account through steganography pictures on her Facebook account.
http://www.technologyreview.com/view/419833/russian-spies-us...
The FBI didn't know about it until after she was caught. So believe it or not, Steganography _works_. If you're trying to hide the fact that you're a spy, encrypting all of your messages over TOR is a bad idea.
On the other hand, if you pretend to be a normal person and embed secret messages in your Facebook posts, you can be a spy for years and not get caught.
Earlier quoted context omitted.
The point of steganoraphy is that no realizes there's a message.
And? It still has key sizes, the enemy still knows the system.
From what I understand, ideally stego would be used in conjunction with encryption.
First, you would encrypt your message, then you would use stego to hide it.
If the stego is good, it would be a computationally intractable problem[2] for your adversary to determine whether there was indeed a message hidden within the data they were analyzing, with greater than 50% accuracy.
That said, I'm not sure how practical using an application like this would be for stego. It does not "whiten" the data it tries to hide, so unless the data's already whitened, it could potentially stand out like a sore thumb when subjected to steganalysis. And how would you propose actually using this?
This does present some intriguing possibilities, however, like maybe having Alice and Bob share a tweaked version of an OCR library and having Alice generate random images until her encrypted message has been "encoded" in such a way as to be recognizable by the tweaked OCR library that she shares with Bob. The tweaking of the library's character recognition parameters could be a sort of pre-shared key, and would not be available to Eve (the adversary).
[1] - this post comes from a hobbyist, not from any kind of security researcher, steganalyst, cryptoanalyst, etc. So please take what I say with a grain of salt and please correct me if I'm wrong.
[2] - "computationally intractable" being different for different adversaries, of course, which is one reason you need a good threat model.
This could be a cool way to visually "encrypt" messages. They're readable, but only by the correct tool. I wonder how these squiggles might be creatively arranged steganographicly in an image and still be "read" by the OCR tool.
Correct me if I'm wrong here, but that just seems like reinventing crypto with a large key, and requires you to implement a counterparty-provided algorithm, which could be malicious.
Or the message itself could also be encrypted with a more secure system, but then physically presented in an open area so that somebody with a tuned recognizer can get the encrypted data to later decrypt digitally.