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On 06/01/2016 03:43 AM, juan wrote: > On Sun, 29 May 2016 11:46:37 -0400 Steve Kinney > <[email protected]> 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) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQEcBAEBAgAGBQJXTxuSAAoJEECU6c5XzmuqgucH/RnqAr2Ac+QjNyR6rDN/vI3m z2wu3YgnfujgKyXqcCBY1YB8bcwHL8YBqfe6MOg4HxToSxb8wpNvKF1qS1YQ+3JG 5y7uMPVzEF4XM/cdzuspZXl06x7gdV8sJNHRsuyxxWaKzvB1zf04XaKkE9wGWm85 8fenFtQbTaQXnn1BhO+93yOjXf61W8Q+F8Fg9h/g7a6jYYjQqmCgGeED9Q4DkIfh Rui4eYRUhAC2uDa8ckvLDWUcEcHXi1eFyqEOVnmk+B0wXPXulsz8SxOvet6Igznl k4DuezjkMKbAsF4gtNmcqgQsrbeDfXmwM1/xjO8d2DKcg82jk6Veb99d35QQfzs= =DwpB -----END PGP SIGNATURE-----
