DISCRETE COSINE TRANSFORM OF ENCRYPTED IMAGES

被引：2

作者：

Bianchi, Tziano ^{[1
]}

Piva, Alessandro ^{[1
]}

Barni, Mauro ^{[2
]}

机构：

[1] Univ Florence, Dip Elettr & Telecomunicaz, Via S Marta 3, I-50139 Florence, Italy

[2] Univ Siena, Dip Ingn Informaz, I-53100 Siena, Italy

来源：

2008 15TH IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, VOLS 1-5 | 2008年

关键词：

Discrete Cosine transforms; error analysis; homomorphic encryption; image encryption; signal processing in the encrypted domain;

D O I：

10.1109/ICIP.2008.4712093

中图分类号：

TP18 [人工智能理论];

学科分类号：

081104 ; 0812 ; 0835 ; 1405 ;

摘要：

Processing a signal directly in the encrypted domain provides an elegant solution in application scenarios where valuable signals must be protected from a malicious processing device. In a previous paper we considered the implementation of the ID Discrete Fourier Transform (DFT) in the encrypted domain, by using the homomorphic properties of the underlying cryptosystem. In this paper we extend our previous results by considering the application of the 2-dimensional DCT to encrypted images. The effect of the consecutive application of the DCT algorithm first by rows then by columns is considered, as well as the differences between the implementation of the direct DCT algorithm and its fast version. Particular attention is given to block-based DCT, with emphasis on the possibility of lowering the computational burden by parallel application of the encrypted domain DCT algorithm to different image blocks.

引用

页码：1668 / 1671

页数：4

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