This tool allows you to embed/extract arbitrary stream of bytes into/from a PNG image.
makeor
g++ -Wall -Werror -std=c++17 src/main.cpp src/pngs.cpp src/crc.cpp -o pngsTo run the test,
make testRun pngs --help
Usage: pngs [OPTIONS] <pngfile> <outfile>
<pngfile> PNG file path
<outfile> output file path
Options:
--help Print this help message
--extract, -x VAL chunk type to be extracted
--secret, -s VAL path of file which is to be hiddenLet’s say you have some message in a text file called secret.txt and a PNG image called image.png. And you want to hide this message inside of image.png and save the new image as output.png.
To do so, run
pngs --secret secret.txt image.png output.pngTo extract the information from output.png, and save the text into a file called extracted-msg.txt, run
pngs --extract scrt output.png extracted-msg.txt