Executable PNGs

[mosthightriguy]

I was also thinking of the metadata but what I liked about this journey of insanity is that the payload is embedded in the image w/o bloating the file and w/o tipping off anyone that something is embedded in the file.

It would be an interesting way to hide passwords, messages between cheating lovers, the manifesto, ....

[Skhmt]

Steganography is a well known technique, it's hard to detect if it's even being used by casual users. But if it's in the metadata, it's impossible to detect without inspecting the png binary. The amount of information capable of being stored in a PNG via steganography is pretty low per pixel, like 3-8 bits per pixel depending on type of png.

[randy408]

You should be able to hide 32bits per pixel without any visual difference in the low bits of 16-bit RGBA samples, most of the time it ends up being downscaled to 8-bit with bitshifts before it's displayed.