We propose a secure display technique based on visual cryptography. The proposed technique ensures the security of visual information. The display employs a decoding mask based on visual cryptography. Without the decoding mask, the displayed information cannot be viewed. The viewing zone is limited by the decoding mask so that only one person can view the information. We have developed a set of encryption codes to maintain the designed viewing zone and have demonstrated a display that provides a limited viewing zone.
© 2003 Optical Society of America
(110.0110) Imaging systems : Imaging systems
(200.3050) Optics in computing : Information processing
(200.3760) Optics in computing : Logic-based optical processing
(200.4660) Optics in computing : Optical logic
(220.4830) Optical design and fabrication : Systems design
Hirotsugu Yamamoto, Yoshio Hayasaki, and Nobuo Nishida, "Securing information display by use of visual cryptography," Opt. Lett. 28, 1564-1566 (2003)