Design of cascaded phase keys for a hierarchical security system

Chia H. Yeh, Hsuan T. Chang, Hung C. Chien, Chung J. Kuo

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)6128-6134
Number of pages7
JournalApplied Optics
Issue number29
Publication statusPublished - 2002 Oct 10
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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