适应性安全的可追踪叛徒的基于属性加密方案

Adaptively secure attribute-based encryption for traitor tracing

针对基于属性加密(ABE,attribute-base encryption)机制存在的密钥滥用问题,为每个用户增加唯一的身份标识符,将联合安全编码和叛徒追踪机制引入到ABE方案中,给出适应性安全的可追踪叛徒ABE的定义、安全模型和可追踪模型,提出一种适应性安全的可追踪叛徒的ABTT方案,该方案允许适应性追踪指定策略盗版解码器中的叛徒。基于合数阶群上的子群判定假设和DDH假设,证明所提方案是适应性安全和适应性可追踪的。因此,所提方案不仅可以适应性追查指定策略盗版解码器中的叛徒,而且进一步增强了ABE系统的安全性,具有一定的理论和应用价值。

For the key abuse problem in attribute-based encryption（ABE）, each user was identified by his unique identity, and the collusion secure codes and the traitor tracing mechanism were introduced to the ABE scheme. The definition, security model and tracing model for adaptively secure attribute-based encryption for traitor tracing（ABTT）were formalized, and an adaptively secure ABTT scheme was proposed, which may trace traitors in policy-specific pirate decorders. Under these subgroup decision assumptions in composite order groups and the DDH assumption, adaptively secure and can adaptively trace traitors were proved. Therefore, the scheme not only was capable of tracing adaptively traitors in policy-specific pirate decorders, but also further strengthens the security of ABE system, which has theoretical and practical values.