Share Email Print
cover

Proceedings Paper • new

Analysis of security of optical encryption with spatially incoherent illumination technique
Author(s): Pavel A. Cheremkhin; Nikolay N. Evtikhiev; Vitaly V. Krasnov; Vladislav G. Rodin; Anna V. Shifrina
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Applications of optical methods for encryption purposes have been attracting interest of researchers for decades. The first and the most popular is double random phase encoding (DRPE) technique. There are many optical encryption techniques based on DRPE. Main advantage of DRPE based techniques is high security due to transformation of spectrum of image to be encrypted into white spectrum via use of first phase random mask which allows for encrypted images with white spectra. Downsides are necessity of using holographic registration scheme in order to register not only light intensity distribution but also its phase distribution, and speckle noise occurring due to coherent illumination. Elimination of these disadvantages is possible via usage of incoherent illumination instead of coherent one. In this case, phase registration no longer matters, which means that there is no need for holographic setup, and speckle noise is gone. This technique does not have drawbacks inherent to coherent methods, however, as only light intensity distribution is considered, mean value of image to be encrypted is always above zero which leads to intensive zero spatial frequency peak in image spectrum. Consequently, in case of spatially incoherent illumination, image spectrum, as well as encryption key spectrum, cannot be white. This might be used to crack encryption system. If encryption key is very sparse, encrypted image might contain parts or even whole unhidden original image. Therefore, in this paper analysis of security of optical encryption with spatially incoherent illumination depending on encryption key size and density is conducted.

Paper Details

Date Published: 6 April 2017
PDF: 7 pages
Proc. SPIE 10127, Practical Holography XXXI: Materials and Applications, 1012714 (6 April 2017); doi: 10.1117/12.2253698
Show Author Affiliations
Pavel A. Cheremkhin, National Research Nuclear Univ. MEPhI (Russian Federation)
Nikolay N. Evtikhiev, National Research Nuclear Univ. MEPhI (Russian Federation)
Vitaly V. Krasnov, National Research Nuclear Univ. MEPhI (Russian Federation)
Vladislav G. Rodin, National Research Nuclear Univ. MEPhI (Russian Federation)
Anna V. Shifrina, National Research Nuclear Univ. MEPhI (Russian Federation)


Published in SPIE Proceedings Vol. 10127:
Practical Holography XXXI: Materials and Applications
Hans I. Bjelkhagen; V. Michael Bove, Editor(s)

© SPIE. Terms of Use
Back to Top