A promising method to thwart global surveillence

[Steve Kinney]

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On 06/01/2016 03:43 AM, juan wrote:
> On Sun, 29 May 2016 11:46:37 -0400 Steve Kinney
> <admin at pilobilus.net> wrote:
> 
> 
>> 
>> Hiding arbitrary data inside media files by flipping bits is
>> likely to fool a human observer, but unlikely to pass through a
>> stego detection filter without tripping an alarm.
> 
> 
> How? Audio and video have noise. You replace the natural noise with
> your 'noise'. How can an observer tell if he's looking at noise
> inherent in audio/video signals or at encrypted, noise-like data?

Short answer:  Statistical analysis; naturally occurring noise and
noise introduced from a "random" source (i.e. encrypted data) and/or
at random positions in the data stream are quantifiably different.

Longer answer:  https://en.wikipedia.org/wiki/Steganalysis

Longest answer:  Stenography & watermarking vs. detection of same is
an ongoing arms race, with substantial advantages on the attacker's side
.

Example of do-it-yourself steganalysis:
http://stegsecret.sourceforge.net/

:o)



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