Optical asymmetric cryptosystem based on photon counting and phase-truncated Fresnel transforms

Abstract

We propose a novel optical asymmetric cryptosystem combining the photon counting imaging with phase-truncated Fresnel transform, which can be used for complete information retrieval and authentication verification. The proposed combination overcomes the weakness of photon counting-based double random phase-encoding scheme. For retrieval of original image for authentication, the reverse process of phase truncation approach is followed and a nonlinear correlation filter is used. The complete information retrieval and authentication verification are possible provided sufficient number of photons is available. To check the robustness of the proposed scheme, attack analysis has been carried out. The simulation results are presented to demonstrate the proposed idea.

Keywords:

• Optical encryption
• phase truncation
• photon counting imaging
• optical correlation
• Fresnel transform

Acknowledgement

The authors acknowledge the funding from the Council of Scientific and Industrial Research (CSIR), Government of India, under grant number 03/(1351)/16/EMR-II. Dr. S. K. Rajput also wishes to acknowledge the funding from the Science and Engineering Research Board (SERB), Government of India, through award No. SB/OS/PDF-117/2015-16.

Disclosure statement

No potential conflict of interest was reported by the authors.