摘要
带通配符的基于身份加密方案(WIBE)大多存在以下缺陷:a)仅达到选择身份(selective-ID)安全,安全系数较低;b)其私钥或密文长度随身份级数呈线性递增,需要耗费大量的存储空间。针对上述问题,运用Waters的双系统加密技术,在Lewko-HIBE方案的基础上提出了一个密文长度固定的带通配符的分级加密方案。新方案结构紧凑,密钥和密文长度均为常数,加/解密运算速度快,减小了存储空间并提高了计算效率。新方案在标准模型下是适应性选择身份(adaptive-ID)安全的,也叫完全安全,安全级别较选择身份安全更高,并且其安全性可归约为三个静态假设。
Most of the existing wildcarded identity-based encryption（WIBE） scheme have the following shortcomings： a）only to selective-ID secure,its secure factor is lower;b）the private key or the ciphertext length increases linearly with the identity level.To resolve these problems,this paper proposed a WIBE with constant ciphertext which based on Lewko-HIBE scheme by using Waters dual systems encryption.The novel scheme has a compact structure,the length of the key and ciphertext are constans,the encryption/decryption is speeded,which all reduce the storage space and improve the computation efficiency.The scheme is adaptive-ID secure（full secure） in the standard model,whose security level is higher than the selective-ID security,and the security is under three static assumptions.
出处
《计算机应用研究》
CSCD
北大核心
2012年第5期1910-1913,1917,共5页
Application Research of Computers
