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OutGuess - general Information
Below you can see an example run of OutGuess. The table gives an
explanation of the different columns in the output.
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$ outguess -k "my secret key" -d hidden.txt demo.jpg out.jpg
Reading demo.jpg....
JPEG compression quality set to 75
Extracting usable bits: 40059 bits
Correctable message size: 21194 bits, 52.91%
Encoded 'snark.bz2': 14712 bits, 1839 bytes
Finding best embedding...
0: 7467(50.6%)[50.8%], bias 8137(1.09), saved: -13, total: 18.64%
1: 7311(49.6%)[49.7%], bias 8079(1.11), saved: 5, total: 18.25%
4: 7250(49.2%)[49.3%], bias 7906(1.09), saved: 13, total: 18.10%
59: 7225(49.0%)[49.1%], bias 7889(1.09), saved: 16, total: 18.04%
59, 7225: Embedding data: 14712 in 40059
Bits embedded: 14744, changed: 7225(49.0%)[49.1%], bias: 7889, tot: 40032, skip: 25288
Foiling statistics: corrections: 2590, failed: 1, offset: 122.585494 +- 239.664983
Total bits changed: 15114 (change 7225 + bias 7889)
Storing bitmap into data...
Writing foil/out.jpg....
| Seed |
Changed Bits |
Bias |
Saved |
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The value of the seed for the result line. |
The number of bits that needed to be changed in the redundant data, and
the percentage in regards to the amound of hidden data. |
The accumulated bias of all changed bits. The bias is a measure for the
detectability of the changes. |
The number of bytes that could be represented without modification of
data. The base line is 50%. |
You can retrieve data from an image in the following way:
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$ outguess -k "my secret key" -r out.jpg hidden.txt
Reading out.jpg....
Extracting usable bits: 40059 bits
Steg retrieve: seed: 7225, len: 1839
OutGuess is known to work on
If you have confirmation that OutGuess also works on other platforms,
please send me an email.
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(c) 1999-2004 by Niels Provos
OutGuess Resources
