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Dr. Naveen K. Nischal

SPIE VISITING LECTURE at Dept. of Physics, IIT Guwahati
on 26^th November, 2018

Dr. Naveen K. Nischal

Indian Institute of Technology, Patna

About the Speaker

Dr. Naveen K Nishchal received his PhD degree in Physics from IIT Delhi. He was former faculty at Dept. of Physics, IIT Guwahati from 2007 to 2008. He also worked at RF Media Laboratory, Oulu Southern Institute, University of Oulu, Finland as a researcher (Summer 2008, 2009, 2010). Presently he is an associate professor at Dept. of Physics, IIT Patna. He is senior member of SPIE, OSA and life member of OSI, Indian Science Congress Association and Lasers and Spectroscopy Society of India. His research area includes Applied Optics - Optical Information Proc-essing, Image Encryption, Water-marking, Digital Holography, Frac-tional Fourier Transform-based Signal Processing, Correlation based Optical Pattern Recognition.

Abstract of Talk

Light for Information Security

With the technological evolution, enormous amount of information/data is being created, stored, and disseminated every day. This requires efficient security systems for storage and exchange of data. Digital schemes for information security, already in use, are being researched further, considering improvement in terms of robustness and speed. The schemes fall short of expectation when data size become very large, the processing time goes up. Security systems employing optical technologies are being developed owing to their inherent features in terms of high speed and security. Optical schemes offer several degrees of freedom such as amplitude, phase, wavelength, polarization, spatial frequency, orbital angular momentum to encode data securely. The techniques have attracted increased attention of researchers after the report (1995) of first pioneering work called ‘Double Random Phase Encoding’. A large number of techniques have been reported in literature expanding the scope with the use of different optical transforms (Fourier, Fresnel, fractional Fourier, gyrator, wavelet). At a later stage, the basic scheme was proved vulnerable due to involved linearity in the method. To overcome the weakness, optical asymmetric cryptosystems have been reported, in which the encoded spectrum is amplitude- and phase-truncated in order to break the linearity in the conventional double random phase encoding technique. In this seminar, the emphasis will be on optical asymmetric encryption schemes utilizing the degrees of freedom.