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Applied Optics

Applied Optics


  • Vol. 41, Iss. 29 — Oct. 10, 2002
  • pp: 6128–6134

Design of cascaded phase keys for a hierarchical security system

Chia H. Yeh, Hsuan T. Chang, Hung C. Chien, and Chung J. Kuo  »View Author Affiliations

Applied Optics, Vol. 41, Issue 29, pp. 6128-6134 (2002)

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An image cryptosystem based on multiple phase-only masks is proposed. The proposed cryptosystem is a hierarchical security system that can use multiple phase keys to retrieve different amounts of data. In addition to the sequential order of the phase keys, the distance parameters among the phase keys are introduced to increase the system security. Even when an illegal user steals all the phase keys, the system cannot be broken without the correct sequential order and the distance parameters. However, the proposed system can verify the identities of the persons by the cascaded structure for the phase keys to generate different verification images. Simulation results are further demonstrated to verify the proposed method.

© 2002 Optical Society of America

OCIS Codes
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(100.3020) Image processing : Image reconstruction-restoration
(100.5070) Image processing : Phase retrieval

Original Manuscript: March 16, 2002
Revised Manuscript: July 11, 2002
Published: October 10, 2002

Chia H. Yeh, Hsuan T. Chang, Hung C. Chien, and Chung J. Kuo, "Design of cascaded phase keys for a hierarchical security system," Appl. Opt. 41, 6128-6134 (2002)

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