Security analysis and modified attack algorithms for a nonlinear optical cryptosystem based on DRPE

Phool Singh, Ravi Kumar, A. K. Yadav, Kehar Singh

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

In this paper, security of a nonlinear optical cryptosystem based on double random phase encoding (DRPE) is analyzed. In the cryptosystem, a time-varying nonlinear term is combined with the classical DRPE technique to enhance security. The advantages of the nonlinear term are its easy distribution and no effect on the decrypted image. Also, it is confirmed that the method is resistant to conventional plaintext attacks such as known-plaintext attack, chosen-plaintext attack, and ciphertext only attack. However, our security analysis shows that the method is vulnerable to the modified chosen-plaintext, and known-plaintext attacks. The original image can be recovered successfully using the proposed attack algorithms. Numerical simulation results are presented to validate the proposed attack methods and test effectiveness of our analysis.

Original languageEnglish
Article number106501
JournalOptics and Lasers in Engineering
Volume139
DOIs
StatePublished - 1 Apr 2021
Externally publishedYes

Keywords

  • Fourier transform
  • Optical encryption
  • Phase retrieval algorithms
  • Security analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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