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PYLSB TOOLKIT 
Version: 0.3
Author: luca.mella@studio.unibo.it
License : Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
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This is a small and simple toolkit that might be usefull during steganalysis, it
is currently composed by 3 general purpose tools:

PICTURE STEGANALYSIS TOOLS

lsb-enancher
	Produce a picture from input image that enhance bit variations. 
	This particular picture might reveal suspicious patterns inside the analyzed image.

lsb-extract
	Dump the 'LSBs' of the image pixel with several modalities. For instance is
	possible to select wich channel consider during extraction ([a][r][g][b]) or 
	which bit consiter ([0..7]). 

	Supported algorithms:
	RAW LSB - examples (pixel/data-bits)
		channels=argb 
			pixel | rgba | rgba | rgba | rgba | 
			data  | 7654   3210 | 7654   3210 | 
		channels=rgb
			pixel | rgb | rgb | rgb | rgb | rgb | rgb | rgb | rgb | rgb | rgb | rgb |
			data  | 765   432   107 | 654   321   076 | 543   210   765 | 432   107 |
		channels=rg
			pixel | rg | rg | rg | rg | rg  
			data  | 76 Basic Profile
		channels=r
			pixel | r | r | r | r 
			data  | 7   6   5   4 
	CLASSIC LSB - examples (pixel/data-bits)
		channel= rgb (mandatory)
			| rgb | rgb | rgb | rgb | rgb | rgb | rgb | rgb | rgb | 
			| 765   432   10- | 765   432   10- | 765   432   10E |
			 '-' means unused, 'E' means end of bit stream (our "EOF")
			 In practice '-' is a 0-bit and 'E' becomes 1-bit

lsb-embed
	lsb-extract's dual tool.
	Embed data from STDINPUT into a picture using the same algorithms

lsb-entropy-b
	Calculate the entropy of a bit string as percentual of 1s, supposedly 
	extracted from an image.

lsb-autocorr-b
	Calculate theautocorrelation of a bit string measuring how much the shifted
	version of the bit string is similar to the original bit string.
	Number of shits and shift step are configurable.

lsb-chisquare
	Perform a chi-square test on an image pixel stream. This statistical test
	helps to determinate when the distribution of lsb is similar to a random 
	distribution (might reveal encrypted or compressed payload).
	If you need graphics use some external tool like gnuplot.

lsb-echo-pixels
	Utiliy that produce a pixel stream in output, in other world it 
	print out the integer values of the image pixels.
	Typical usage: /lsb-echo-pixels -f image.png | ./lsb-chisquare


USAGE:
	./lsb-extract.py -f image.png -o dump -c rgb -b 012
Means that you will extract the bit 0,1 and 2 from every pixel considering rgb 
channels. Note that rgb is different than grb and 012 is different than 102 !

Use --help on each tool for further detail.

FUTURE DEVELOPMENT:
	- Support audio too..
	- Support more algorithms
	- Support more analysis (RS analysis?)
Source: README, updated 2012-05-01