Fig. 6: A dual-channel 4D encryption system.
From: Multi-mode geometrically gated encryption with 4D morphing hydrogel
a ASCII code representation. Upon shape changing, the flat location indicates “0” while the spiral location indicates “1”. b Geometry information display. In the hydrogel strip, the thermo-initiated area reveals “0” and the photo-initiated area reveals “1”. c Illustrations and images of 4D information encryption and verification. The 2D QR code (visible under natural light) and the 1D barcode (visible under 254 nm light) are encoded onto the hydrogel sheet. The nether barcode is cut, and the verification can be then performed. Scale bars: 1 cm.
