4 ms·
Wouldn't a simple re-encode break any sort of stenography?
by mitchell_h 11y ago
Wouldn't a simple re-encode break any sort of stenography?
- fredley 11y agoNo. There are algorithms out there that can survive compression[1] by encoding statistically over an image instead of just bit manipulation. You can also embed data in the audio channel by alternating between two imperceptible echo kernels for 1/0[2]. This is extremely compression resistant. 1: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4428921&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D4428921 http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumb... 2: http://www.slidefinder.net/a/audio_steganography_echo_data_hiding/jeff_england_audio_steganography/24367218 http://www.slidefinder.net/a/audio_steganography_echo_data_h...
- psk 11y agoSurely it would be possible to create encoding resistant stenography. Will the stenography be affected, sure, but it should be possible to create error-resistant stenography up to a certain point.
- dTal 11y agoStenography: encode information such that it is below the human detection threshold. Lossy compression: discard all sub-threshold information. Thus, in the general case it's fundamentally impossible. You can make a scheme that will survive certain known encoders and bitrates, but you can't make one that will survive all lossy compression.