中文摘要：

针对现有的广播加密方案效率与安全性难以兼顾的事实,利用Waters双系统密码技术及混合阶群双线性运算的正交性,提出了一个双系统密码技术下的公钥匿名的身份型广播加密方案.该方案建立在标准模型下,具有尺寸固定的短的密文与密钥,更无需使用任何哈希函数及随机标签,具有较高的计算效率与存储效率,其安全性依赖于3个简单的静态假设.证明结果显示,所提出的方案达到了匿名性及完全安全性的高安全级别要求.

英文摘要：

A fully secure anonymous identity-based broadcast encryption scheme was proposed by combining the Waters dual system encryption with the orthogonality property of composite-order bilinear groups.Based on the standard model without tags,the scheme can achieve constant-size key and ciphertext which constrain three group exponents,respectively.The scheme is proved by using the three static assumptions which do not depend on the number of queries the attacker makes.Furthermore,the analysis results indicate that the scheme proposed in this paper is fully secure and can satisfy the higher efficiency and practice requirement.