CAJ | 학술논문

基于图像编码流的结构和相关性特点，提出了一种分组丢失顽健的可伸缩流认证方法。通过利用散列链和纠错编码算法构造认证算法，该方法可实现优化的码率分配以及非平等认证保护（UAP, unequal authentication protection）。首先对图像编码码流进行解析，获得层次结构信息和编解码依赖性；然后，根据码流数据对重构图像质量的重要程度，利用散列链将次重要的码流数据链接到重要数据上；最后对解码独立码流的散列值和整个码流的数字签名进行纠错编码，提高认证算法对分组丢失的顽健性。该方法仅需要对整个图像码流做一次签名，具有很低的认证代价。实验结果表明，与其他3种流认证算法相比，此法的认证图像具有更高的重构质量。
기우도상편마류적결구화상관성특점，제출료일충분조주실완건적가신축류인증방법。통과이용산렬련화규착편마산법구조인증산법，해방법가실현우화적마솔분배이급비평등인증보호（UAP, unequal authentication protection）。수선대도상편마마류진행해석，획득층차결구신식화편해마의뢰성；연후，근거마류수거대중구도상질량적중요정도，이용산렬련장차중요적마류수거련접도중요수거상；최후대해마독립마류적산렬치화정개마류적수자첨명진행규착편마，제고인증산법대분조주실적완건성。해방법부수요대정개도상마류주일차첨명，구유흔저적인증대개。실험결과표명，여기타3충류인증산법상비，차법적인증도상구유경고적중구질량。
Based on structures and dependencies of the image codestreams, a scalable stream-level authentication ap-proach was proposed to resist packet loss. To construct the authentication algorithm by hash chaining and error-correction coding, the proposed approach can realize optimizing bit-rate allocations and unequal authentication protection. Firstly, the compressed streams of the original image are analyzed to obtain hierarchical structures and coding dependencies. Secondly, in accordance with the differentiation-importance of codestreams to the reconstructed image, sub-important packet is linked to more important packets via hash chains. Finally, these hash values of decoding-independent packets and the digital signature of the whole bitstream are encoded with an error-correction coding algorithm. The proposed scheme has a very low authentication overhead because it signs on the whole image once. Experimental results show that the authenticated image of the proposed scheme has high reconstructed quality than the other three stream-level authenti-cation schemes.