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Joint compression and encryption of visual data using orthogonal parametric transforms

Puchala D., Yatsymirskyy M. M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2016

Vol. 64, nr 2

373--382

In this paper, we introduce a novel method of joint compression and encryption of visual data. In the proposed approach the compression stage is based on block quantization while the encryption uses fast parametric orthogonal transforms of arbitrary forms in combination with a novel scheme of intra-block mixing of data vectors. Theoretical analysis of the method indicates no impact of encryption stage on the effectiveness of block quantization with an additional step of first order entropy coding. Moreover, a series of experimental studies involving natural images and JPEG lossy compression standard were performed. Here, the obtained results indicate a high level of visual content concealment with only a small reduction of compression performance. An additional analysis of security allows to state that the proposed method is resistant to cryptanalytic attacks known for visual data encryption schemes including the most efficient NZCA attack. The proposed method can be also characterized by high computational efficiency and feasibility of hardware realizations.

Comparison of selected fast orthogonal parametric transforms in data encryption

Puchała D.

Journal of Applied Computer Science

2015

Vol. 23, nr 2

55--68

In this paper, we present the results of experimental comparison of fast parametric orthogonal transforms with three popular computational structures with respect to their practical applications to data encryption. The presented results concern the experimental determination of: (1) probability distribution of generating private keys that differ by the given number of bits, (2) probability distribution of signal reconstruction error during the simulation of brute force attack and (3) expected reconstruction error in the function of Hamming distance between private keys.