> An alternative to sealing is embedding the whole object in a substance whose surface forms a mosaic that is difficult to reproduce and changes when manipulate

> An alternative to sealing is embedding the whole object in a substance whose surface forms a mosaic that is difficult to reproduce and changes when manipulated. The problem with a QR code is the “difficult to reproduce” part —- if you can organize the rice in such a way that it’s recognized as a valid QR code, surely the attacker can recreate the same QR code (or an equivalent, since QR codes have redundancy/ECC).