Perfect Steganography

Quanta: "Secret Messages Can Hide in AI-Generated Media 

While it might be impossible to guarantee security for text created by humans, a new proof lays out for the first time how to achieve perfect security for steganography in machine-generated messages — whether they’re text, images, video or any other media. The authors also include a set of algorithms to produce secure messages, and they are working on ways to combine them with popular apps.

Direct link to academic paper: "Perfectly Secure Steganography Using Minimum Entropy Coupling"