Video Content Confidentiality Comparsion Scheme Based on ElGamal System
Yu Pen · Jisuanji gongcheng · 2014
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.