Visual information encryption in frequency domain: risk and enhancement

Authors:
Weihai Li;Yuan Yuan
Affiliations:
Department of Electronic Engineering and Information Science, University of Sciences and Technology of China, Hefei, Anhui, P.R. China;School of Computing and Applied Science, Aston University, Birmingham, United Kingdom
Venue:
IWICPAS'06 Proceedings of the 2006 Advances in Machine Vision, Image Processing, and Pattern Analysis international conference on Intelligent Computing in Pattern Analysis/Synthesis
Year:
2006

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Abstract

Focusing on the encryption of digital image and video, this paper reports an intrinsic weakness of all existing discrete-cosine-transform (DCT) based algorithms. This serious weakness of DCT is analyzed theoretically and then demonstrated practically. As an instance, a novel attack algorithm is proposed to acquire the sketch information from the encrypted data without any pre-knowledge of the encryption algorithm. Thereafter, to solve this problem, a full inter-block shuffle (FIBF) approach is developed and it can be employed to improve the encryption security in all DCT-based algorithms, such as JPEG, MPEG and H.26x.