Inspired by squids and octopi, flexible screen stores and displays encrypted images without electronics

https://techxplore.com/news/2024-09-squids-octopi-screen-displays-encrypted.html

"mechanical materials use magnetic fields, not electronics, for system-level encryption, information processing, computing... clothing, stickers, ID badges, barcodes, e-book readers, wrist bands... encode using magnets with different strengths/ orientations selectively changed polarization... reveals image when near standard magnet, or private image using complex magnet encryption (no code/ electronics to be hacked)... shaking screen erases until magnetized again... also: color-changing surfaces (camouflage)"

Related: A color-changing phosphor can encode information
https://phys.org/news/2026-04-phosphor-encode.html