基于时空混沌的JPEG图像加密算法

Yuling Luo, Minghui Du, Dong Liu
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引用次数: 9

摘要

近年来,为了防止图像被非法访问和分发,提出了各种图像加密算法,但大多数算法只对空域进行加密操作,而没有考虑其相应的压缩。因此,为了保证压缩比和图像质量的水平,本文提出了一类基于时空混沌的JPEG图像加密算法。在这里,只有DC系数被提取和分割,以便所有离散余弦变换(DCT)系数的一般统计分布保持不变。在加密过程中,利用一个时空混沌系统对DCT块进行洗牌并扩散量化的DC系数。分析和实验结果表明,该加密算法具有良好的安全性和压缩率。
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JPEG Image Encryption Algorithm Based on Spatiotemporal Chaos
Recently, various image encryption algorithms have been proposed in order to images from unauthorized access and distribution, and most of them only has the operation on encryption in spatial domain, but no consideration of its corresponding compression. Therefore, to ensure the level of compression ratio and image quality, a class of JPEG image encryption algorithm based on spatiotemporal chaos is proposed in this paper. Here, only the DC coefficients are extracted and split so that general statistical distribution of all Discrete Cosine Transform (DCT) coefficients remains unchanged. For the encryption process, a spatiotemporal-chaos system is utilized to shuffle the DCT blocks and diffuse the quantized DC coefficients. Analysis and experimental results show the encryption algorithm is secure and the compression ration is good.
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