Optical image encryption via photon-counting imaging and compressive sensing based ptychography. (27th May 2015)

• Record Type: Journal Article
• Authors: Rawat, Nitin; Hwang, In-Chul; Shi, Yishi; Lee, Byung-Geun
• Is Part Of: Journal of optics. Volume 17:Number 6(2015:Jun.)
• Publication Date: 2015-05-27
• Subjects: optical security and encryption -- photon-counting imaging -- coherence imaging -- compressive sensing; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8978/17/6/065704
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: In this study, we investigate the integration of compressive sensing (CS) and photon-counting imaging (PCI) techniques with a ptychography-based optical image encryption system. Primarily, the plaintext real-valued image is optically encrypted and recorded via a classical ptychography technique. Further, the sparse-based representations of the original encrypted complex data can be produced by combining CS and PCI techniques with the primary encrypted image. Such a combination takes an advantage of reduced encrypted samples (i.e., linearly projected random compressive complex samples and photon-counted complex samples) that can be exploited to realize optical decryption, which inherently serves as a secret key (i.e., independent to encryption phase keys) and makes an intruder attack futile. In addition to this, recording fewer encrypted samples provides a substantial bandwidth reduction in online transmission. We demonstrate that the fewer sparse-based complex samples have adequate information to realize decryption. To the best of our knowledge, this is the first report on integrating CS and PCI with conventional ptychography-based optical image encryption.