Since the diffractive optical variable device usually lies above the laser-engraved photograph, the remaining threat – photo substitution by milling from the rear of the card – is effectively deterred by introducing overt or covert antenna design elements beneath the portrait.
As the design elements form an integral part of the electronic circuit, milling from the rear will effectively disengage the chip functionality thereby forcing the attacker to counterfeit the complete card.
- Permits visual inspection of electronic components (document specific designs)
- Protection against chip/antenna substitution
- Protection against manipulation of photo from rear side
- Chip disengaged when antenna is manipulated