Research on the algorithm of multiple-image encryption based on the improved virtual optical imaging
- 1. College of Opto-Electronic Engineering, Nanjing University of Post and Telecommunications, Nanjing 210046, China;
- 2. College of Computer, Nanjing University of Post and Telecommunications, Nanjing 210046, China
- Received Date:
- Accepted Date:
- Available Online:
Project supported by the National Basic Research Program of China (Grant No. 2011CB302903), the National Natural Science Foundation of China (Grant Nos. 61272084, 61202353), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2009426), and the Key University Natural Science Research Project of Jiangsu Province, China (Grant No. 11KJA520002).
Abstract: In this paper we propose an algorithm for multiple-image encryption based on the improved virtual optical imaging (VOI). The improved algorithm enhances the security by integrating several images into one as an encrypting object and increasing key space. It focuses on three issues. First, it encrypts the phase information, which can improve the performance of decryption effect of the system. Second, it combines random phase plate with a random amplitude board at the position of the random phase plate to increase the dimension of the key space and the ability to resist the attacks. Finally, it adds a random phase plate before the image place, which enhances the security of the system. It uses the peak signal-to-noise ratio to evaluate the performance of the proposed algorithm. Compared with the traditional VOI-based encryption method, the simulations show that the proposed method demonstrates a good performance in the sense of feasibility, robustness and security.