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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Visual Information Encryption in Frequency Domain: Risk and Enhancement
verfasst von : Weihai Li, Yuan Yuan
Erschienen in: Advances in Machine Vision, Image Processing, and Pattern Analysis
Verlag: Springer Berlin Heidelberg
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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.