计算机科学 ›› 2017, Vol. 44 ›› Issue (8): 168-175.doi: 10.11896/j.issn.1002-137X.2017.08.030
胡小明,马闯,斯桃枝,蒋文蓉,许华杰,谭文安
HU Xiao-ming, MA Chuang, SI Tao-zhi, JIANG Wen-rong, XU Hua-jie and TAN Wen-an
摘要： 无证书广义指定验证者聚合签名(CTL-ASWUDV)能有效解决签名者的隐私保护问题。针对最近指出的张玉磊等学者的CTL-ASWUDV方案构造无效且不满足两类敌手攻击的问题,提出了一个改进的CTL-ASWUDV方案(CTL-ASWUDV-1)。该方案在保持了原方案中聚合签名长度和双线性配对数固定的优点的同时,有效克服了两类敌手的攻击。进一步提出了一个更加高效的CTL-ASWUDV方案(CTL-ASWUDV-2)。在随机预言机模型下,证明该方案的安全性可规约为CDH问题。同时,该方案与目前已有的同类方案相比具有如下优势:单个签名和聚合签名无需双线性配对运算,而且聚合签名验证所需的双线性配对数量与签名人数无关,与单个签名验证数量相当,都是1个配对运算；聚合签名长度和指定验证者签名长度与签名人数无关,与单个签名长度相当,都是固定的1个元素,大大节省了网络带宽。
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