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[–] Alopix 0 points 0 points (+0|-0) ago 

What's all that? Make a .7z archive(or any other file) and put it at the end of any other file. Password protect the archive if you want encryption.

On Windows:

copy /b coverfile + filetohide nameofmergedfile

On Linux:

cat coverfile filetohide > nameofmergedfile

Archives are typically used as filetohide for usefulness and ease(archivers ignore extra data at the start,) and images as coverfile because photo viewers ignore extra at the end. The combo is convincing and easy to separate. That said, the files can be anything.

This method as well as any program you find on google is detectable. 7z+img concatenation requires no special software on the recipient's part, just an archive program of any sort.

To be undetected you would need a tool with a custom algorithm and anyone you sent it to would need the same program.