素数阶群上具有扩展通配符的ABE方案

ABE Scheme with Generalized Wildcards on Prime Order Groups

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)能够方便地解决上述问题。目前自适应安全的GWABE方案均在合数阶群上构造。针对合数阶上双线性映射计算开销过大的问题,以对偶正交基技术为基础,提出了一种素数阶群上自适应安全的GWABE方案,同时将该方案的安全性归约到判定性线性假设。性能分析表明,该方案在达到自适应安全的基础上,具有更好的效率。

Traitor tracing and revocation are crucial to use of ABE.ABE scheme with generalized wildcards（GWABE）is a convenient way for solving these problems.Previous adaptively secure GWABE scheme suffers from superfluous computation overhead because they are designed on composite order groups.To tackle this problem,an adaptively secure GWABE scheme on prime order groups was proposed when a dual pairing vector space approach was employed.The proposed scheme is proven adaptively secure from the decisional linear assumption.Performance analysis indicates that this scheme is more efficient while achieving the adaptive security.