Outguess is a universal steganographic tool that allows the insertion of hidden information into the redundant bits of data sources. The nature of the data source is irrelevant to the core of outguess. The program relies on data specific handlers that will extract redundant bits and write them back after modification. Currently only the PPM, PNM, and JPEG image formats are supported, although outguess could use any kind of data, as long as a handler were provided.



[options] [<input file> [<output file>]]


        -[sS] <n>    iteration start, capital letter for 2nd dataset
	-[iI] <n>    iteration limit
	-[kK] <key>  key
	-[dD] <name> filename of dataset
	-[eE]        use error correcting encoding
	-p <param>   parameter passed to destination data handler
	-r           retrieve message from data
	-x <n>       number of key derivations to be tried
	-m           mark pixels that have been modified
	-t           collect statistic information
	-F[+-]       turns statistical steganalysis foiling on/off.
	             The default is on.


To embed the message : 

cyborg@cyborg:~$ outguess -k "hello" -d a.txt google.jpg out.jpg
Reading google.jpg....
JPEG compression quality set to 75
Extracting usable bits:   8902 bits
Correctable message size: 4552 bits, 51.13%
Encoded 'a.txt': 776 bits, 97 bytes
Finding best embedding...
    0:   383(47.4%)[49.4%], bias   128(0.33), saved:     0, total:  4.30%
   14:   391(48.4%)[50.4%], bias   109(0.28), saved:     0, total:  4.39%
  104:   376(46.5%)[48.5%], bias   123(0.33), saved:     1, total:  4.22%
  132:   388(48.0%)[50.0%], bias    78(0.20), saved:     0, total:  4.36%
132, 466: Embedding data: 776 in 8902
Bits embedded: 808, changed: 388(48.0%)[50.0%], bias: 78, tot: 8880, skip: 8072
Foiling statistics: corrections: 190, failed: 30, offset: 430.669421 +- 472.674983
Total bits changed: 466 (change 388 + bias 78)
Storing bitmap into data...
Writing out.jpg....

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