摘要： 针对视频内容比较过程中内容易泄露和通信开销大的问题，提出一种基于ElGamal体制的视频内容保密比较方案。综合利用视频编码、篡改和人眼视觉特征，提取视频帧中每个条带的最后一个宏块亮度分量作为特征数据，对特征数据进行分组，并计算哈希值。设计改进的ElGamal算法，在交互双方间共享一个大素数，使其满足可交换性，并利用该算法，在不泄露视频内容的前提下，对双方视频的分组哈希值进行保密比较，从而判断视频是否被篡改，并定位篡改发生的区域。实验结果表明，该方案计算复杂度低、通信量小，且具有较好的安全性和公平性。
关键词:
ElGamal体制,
保密比较,
视频编码,
篡改,
特征数据,
可交换性
Abstract: Video has the problem of content leak and high communication cost in the process of comparison, so this paper proposes a kind of video content confidential comparison scheme based on ElGamal system. Combined with video encoding, tampering and human visual features, the last macroblock’s luminance component of video frame slice is extracted as the feature data. The feature data is grouped and calculated hash value. It designs the improved ElGamal algorithm, which makes a large prime number be shared between the two parties to satisfy the interchangeability. Using the interchangeable ElGamal algorithm, on the premise of not leaked video content, it makes confidential comparison on the grouped hash values of two parties judge whether the video is tampered and locate the tampered area. Experimental results show that this scheme has low computing complexity and small communication amount, and it also has good security, fairness.
Key words:
ElGamal system,
confidentiality comparison,
video encoding,
tampering,
feature data,
interchangeability
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