具有扩展通配符的快速解密ABE方案  

ABE Scheme of Fast Decryption with Generalized Wildcards

作　　者：李作辉[1] 陈性元[1] 

机构地区：[1]信息工程大学密码工程学院,郑州450000

出　　处：《计算机工程》2016年第8期96-100,共5页Computer Engineering

基　　金：国家"973"计划基金资助项目(2011CB311801)

摘　　要：叛徒追踪和撤销是基于属性的加密(ABE)在实际应用中需要解决的问题,具有扩展通配符的ABE方案(GWABE)能够较好地解决上述问题。针对现有GWABE方案解密计算开销随参与解密属性的数量线性增长的问题,利用双线性群上的数学性质,提出一种快速解密ABE方案,并将该方案的安全性归约到判定性q-BDHE假设。分析结果表明,该方案解密时双线性配对为常数次,在参数解密属性数量为1时,与基于属性的叛徒追踪方案和GWABE方案相同,随着参数解密属性数量增加,性能优势逐步变大。Traitor tracing and revocation are crucial to the use of Attribute-based Encryption （ ABE）, ABE scheme with Generalized Wildcards （GWABE） is a convenient way to solve the problems. Since the decryption cost of existing GWABE scheme increases linearly with the number of attributes used in decryption, an ABE scheme with Fast decryption and Generalized wildcards （FGWABE） is proposed with the assistance of mathematical properties of bilinear group. This scheme is proven secure from the decisional q-parallel Bilinear Diffie-hellman Exponent （q-BDHE） assumption. Performance analysis result shows that the ciphertexts of this scheme can be decrypted with a constant number of pairings. When one attribute is used in decryption, this number in FGWABE is the same as that of Attribute-based Traitor Tracing （ABTT） scheme and GWABE scheme. FGWABE is more efficient as the number of attributes increases.

关 键 词：基于属性的加密 叛徒追踪 撤销 快速解密 双线性群 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]