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中文摘要：
针对当前密文域可逆信息隐藏技术可分离性差、载体恢复存在较大失真的问题,提出了一种可分离的密文域可逆信息隐藏方案,通过对LWE（learning with errors）公钥密码算法加密后数据的再编码,实现在密文的可控冗余中嵌入隐藏信息;嵌入信息后,使用隐写密钥可以有效提取隐藏信息,使用解密密钥可以无差错恢复出加密前数据,提取过程与解密过程可分离。理论推导论证了本方案信息提取过程与嵌入后明文解密过程的可分离性与结果的正确性,仿真实验结果表明与现有算法相比,方案在实现可分离的密文域可逆信息隐藏的基础上充分保证了密文域隐写后的可逆性,并且方案的实现与原始载体种类无关,适用性较强。
英文摘要：
This paper proposed a novel scheme of separable reversible steganography in encrypted domain. Additional data can be embedded by recoding in the redundancy of cipher text. With embedded cipher text, the additional data can be extracted by using data-hiding key, and the original data can be recovered lossless by using encryption key, and the processes of extraction and decryption are separable. By deducing the error probability of the scheme, this paper mainly discussed parameters in the scheme which directly related to the scheme＇ s correctness, and obtained reasonable values of the parameters by experiments. The proposed scheme was based on encrypted domain, so it could apply to different kinds of media vehicle. Experimental results demonstrate that the proposed scheme can better guarantee the reversibility losslessly than the previous separable methods.
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