使用空间非线性光学的图像加密
空間非線形光学を使用した画像暗号化
공간 비선형 광학을 사용한 이미지 암호화
Cifrado de imágenes mediante óptica espacial no lineal
Cryptage d'images à l'aide d'optiques spatiales non linéaires
Шифрование изображений с использованием пространственной нелинейной оптики
Junfeng Hou 侯俊峰 ¹ ², Guohai Situ 司徒国海 ²
¹ Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, 201800, Shanghai, China
中国 上海 中国科学院上海光学精密机械研究所
² Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 310024, Hangzhou, China
中国 杭州 中国科学院大学杭州高等研究院
Optical technologies have been widely used in information security owing to its parallel and high-speed processing capability. However, the most critical problem with current optical encryption techniques is that the cyphertext is linearly related with the plaintext, leading to the possibility that one can crack the system by solving a set of linear equations with only two cyphertext from the same encryption machine. Many efforts have been taken in the last decade to resolve the linearity issue, but none of these offers a true nonlinear solution.
Inspired by the recent advance in spatial nonlinear optics, here we demonstrate a true nonlinear optical encryption technique. We show that, owing to the self-phase modulation effect of the photorefractive crystal, the proposed nonlinear optical image encryption technique is robust against the known plaintext attack based on phase retrieval. This opens up a new avenue for optical encryption in the spatial nonlinear domain.
