摘要
NP(non-deterministic polynomial)证据加密(witness encryption,WE)是近来提出的一种新型的没有密钥生成过程的加密方案,可以用来构建许多其他的密码系统如公开密钥加密、IBE(identity based encryption)、ABE(attribute based encryption)等。该文提出WE的一种新应用:用WE构建可撤销广播加密系统,并且所构建的广播加密方案能支持简单的成员重加入功能(如付费电视);在构建的过程中指出以前的WE安全性定义不够严格,对原WE安全性定义进行了增强,并基于原WE方案和子集成员分辨难题、ROM(random oracle model)模型提出了一个新方案。
Witness encryption （WE） is a new type of encryption scheme without key generation. It can be used for construction of many other cryptosystems such as public key encryption, IBE, ABE, etc. A new WE application is presented, i.e., the construction of revocable broadcast encryption （BE） based on WE. The constructed BE scheme also supports a simple re-membership function, which is suitable for applications like pay-TV etc. In the construction, we also point out that the original security definition of WE is not strong enough. So we strengthen the original WE security definition and construct a WE scheme satisfying this new definition based on the original WE scheme, hard subset membership problem and random oracle model.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2016年第6期969-973,共5页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(71271056)
福建省自然科学基金(2016J01336)
关键词
广播加密
子集成员分辨难题
成员撤销
NP证据加密
broadcast encryption
hard subset membership problem
membership revocation
NP witness encryption
