Secure display that limits the viewing space by use of optically decodable encryption

Hirotsugu Yamamoto; Yoshio Hayasaki

doi:10.1117/12.703098

8 February 2007 Secure display that limits the viewing space by use of optically decodable encryption

Hirotsugu Yamamoto, Yoshio Hayasaki

Proceedings Volume 6482, Advanced Optical and Quantum Memories and Computing IV; 64820C (2007) https://doi.org/10.1117/12.703098
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We propose a secure display that limits the viewing space three-dimensionally by use of optically decodable encryption. A secret image is encrypted into a displayed image and a decoding mask. The decryption process is based on optical logic and performed without calculation. The secret is visible within the limited viewing space. However, the viewed results outside the viewing space look like random-dot pattern. When viewed at a distance different from the designed viewing distance, only the central area of the secret is faintly visible for a limited direction. When a user watches the secure display, in practice, the user's head prevents peeping at the secret. The relationships between the size and the position of the displayed image and the viewing space have been analyzed and confirmed experimentally. The proposed technique has been demonstrated by use of two-layered liquid-crystal displays. Furthermore, 3D displacement of the viewing space have been realized only by renewing the displayed image, i.e., without any mechanical movements. By using the decoding mask as the key for decryption, no one can view the secret image without the knowledge of the decoding mask pattern, and the viewed image is secure against prying eyes behind the viewer.

Citation Download Citation

Hirotsugu Yamamoto and Yoshio Hayasaki "Secure display that limits the viewing space by use of optically decodable encryption", Proc. SPIE 6482, Advanced Optical and Quantum Memories and Computing IV, 64820C (8 February 2007); https://doi.org/10.1117/12.703098

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available