zsteg

Steganography detection tool for PNG and BMP file formats.

TLDR

Detect embedded data in a PNG image

$ zsteg [path/to/image.png]
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Detect embedded data in a BMP image, using all known methods

$ zsteg --all [path/to/image.bmp]
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Detect embedded data in a PNG image, iterating pixels vertically and using MSB first

$ zsteg --msb --order yx [path/to/image.png]
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Detect embedded data in a BMP image, specifying the bits to consider

$ zsteg --bits [1,2,3|1-3] [path/to/image.bmp]
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Detect embedded data in a PNG image, extracting only prime pixels and inverting bits

$ zsteg --prime --invert [path/to/image.png]
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Detect embedded data in a BMP image, specifying the minimum length of the strings to be found and the find mode

$ zsteg --min-str-len [10] --strings [first|all|longest|none] [path/to/image.bmp]
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Help

Usage: zsteg [options] filename.png [param_string] 

    -c, --channels X                 channels (R/G/B/A) or any combination, comma separated 
                                     valid values: r,g,b,a,rg,bgr,rgba,r3g2b3,... 
    -l, --limit N                    limit bytes checked, 0 = no limit (default: 256) 
    -b, --bits N                     number of bits, single int value or '1,3,5' or range '1-8' 
                                     advanced: specify individual bits like '00001110' or '0x88' 
        --lsb                        least significant BIT comes first 
        --msb                        most significant BIT comes first 
    -P, --prime                      analyze/extract only prime bytes/pixels 
        --invert                     invert bits (XOR 0xff) 
    -a, --all                        try all known methods 
    -o, --order X                    pixel iteration order (default: 'auto') 
                                     valid values: ALL,xy,yx,XY,YX,xY,Xy,bY,... 
    -E, --extract NAME               extract specified payload, NAME is like '1b,rgb,lsb' 

        --[no-]file                  use 'file' command to detect data type (default: YES) 
        --no-strings                 disable ASCII strings finding (default: enabled) 
    -s, --strings X                  ASCII strings find mode: first, all, longest, none 
                                     (default: first) 
    -n, --min-str-len X              minimum string length (default: 8) 
        --shift N                    prepend N zero bits 

    -v, --verbose                    Run verbosely (can be used multiple times) 
    -q, --quiet                      Silent any warnings (can be used multiple times) 
    -C, --[no-]color                 Force (or disable) color output (default: auto) 

PARAMS SHORTCUT 
zsteg fname.png 2b,b,lsb,xy  ==>  --bits 2 --channel b --lsb --order xy 

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