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Optical image cryptosystem based on adaptive steganography

机译:基于自适应隐写术的光学图像密码系统

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This paper presents a public-key-based optical image cryptosystem with adaptive steganography for practical secure communications. The optical image cryptosystem employs a hybrid architecture for ciphering and deciphering in which double random-phase encoding and asymmetric encryption algorithms are utilized for images and session keys, respectively. The session key is safely protected and transmitted by using an asymmetric encryption algorithm and an adaptive stegano-graphic scheme, respectively. To perform the adaptive steganographic scheme, a sorting technique is used to find the suitable embedding position in the embedding domain, a least-significant-bit truncation algorithm is presented to find the invariant hiding order, and a quantization-based data-embedding algorithm is utilized to hide message bits. Experimental results show that the proposed scheme is superior to that of a previous one due to Lin et al., no matter what embedding domain, quantization level, and message size are used. Especially, compared with the latter scheme a large improvement (22.56 dB) of image quality is achieved by using the proposed adaptive steganographic scheme.
机译:本文提出了一种具有自适应隐写技术的基于公钥的光学图像密码系统,用于实际的安全通信。光学图像密码系统采用混合架构进行加密和解密,其中双重随机相位编码和非对称加密算法分别用于图像和会话密钥。分别使用非对称加密算法和自适应隐写图形方案来安全地保护和传输会话密钥。为了执行自适应隐写方案,使用排序技术在嵌入域中找到合适的嵌入位置,提出了一种最小有效位截断算法以找到不变的隐藏顺序,并基于量化的数据嵌入算法为:用于隐藏消息位。实验结果表明,无论使用哪种嵌入域,量化级别和消息大小,由于Lin等人的提议,该方案都优于以前的方案。特别是,与后一种方案相比,通过使用所提出的自适应隐写方案,可以实现图像质量的大幅提高(22.56 dB)。

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