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steghide is a mature GPL-licensed CLI tool for hiding arbitrary data inside of of image files (and some archaic audio formats). Its official web presence is located at https://steghide.sourceforge.net/. it conceals data inside a larger coverfile in a way that is indistinguishable to first-order statistical analysis. This means there is are anomalies in the file histogram, making most pictures innocuous without an original to compare to.