Fig. 6: Design and concept of 4D information encryption and decryption.

i-iv Dynamic changes from a 1D monochromatic bar code to a 4D colored bar code. I-t curves of RGB components in a LCPC-D (blue line for intensity at 433 nm and green line for intensity at 510 nm), b LCPC-T (blue line for intensity at 433 nm and red line for intensity at 600 nm), c LCPC-D/T (blue line for intensity at 433 nm, green line for intensity at 510 nm, and red line for intensity at 600 nm), and d LCPC-S/D/T films (blue line for intensity at 433 nm, green line for intensity at 510 nm, and red line for intensity at 600 nm) used for authenticating information.