This is a simple tool for image steganography written in Kotlin. The tool allows embedding any given file within the least-significant bits of an image and extracting hidden files from images. Supported image formats are tiff, bmp, gif, wbmp, png.
We provide a command-line interface for the tool as a jar file (steg.jar). The tool can be executed with two subcommands: embed and extract.
Usage: java -jar steg.jar embed [OPTIONS] INPUTIMAGEPATH OUTPUTIMAGEPATH
Embed a file or a string in an image
Options:
--number-of-bits INT Number of least-significatn bits to use for
encoding the message. Must be between 1 and 8.
--message-file-path TEXT Path to the file to hide in the image.
--message TEXT Message to encode.
-h, --help Show this message and exit
Arguments:
INPUTIMAGEPATH Path to the input image.
OUTPUTIMAGEPATH Path to the output image. Output image format must be tiff,
bmp, gif, wbmp, or png.
Usage: java -jar steg.jar extract [OPTIONS] INPUTIMAGEPATH
Extract a file or a string from an image.
Options:
--output-directory-path TEXT Path to the directory where the hidden file
will be output.
-h, --help Show this message and exit
Arguments:
INPUTIMAGEPATH Path to the input image.