可撤销属性的格基属性加密方案

针对量子环境下属性加密体制中属性撤销的问题,结合Zhang等提出的格上基于密文的属性加密方案,在格上构建了一个可撤销属性的格基属性加密方案。通过属性撤销列表,在二叉树结构下将未被撤销属性对应的密钥进行更新,从而达到撤销属性的目的。利用Shamir门限秘密共享的思想,实现了门限访问控制策略。该方案在随机预言机模型下是选择性安全的,安全性规约到错误学习问题。分析表明该方案在量子攻击下是安全的,并且支持灵活的门限访问控制策略。

Revocable Attribute-based Encryption from Lattice

To resolve the problems of revocation under the quantum computing, combined with Zhang''s scheme, the paper constructs an attributed-based encryption which is revocable from lattice. This scheme updates the key which is associated with un-revocable attributes under the binary tree structure. By using the idea of Shamir''s threshold secret sharing scheme, a threshold access policy is realized in this paper. The scheme is selectively secure where the security is reduced to the hardness of learning with error problems in the random oracle model. The analysis shows that the scheme is secure under the quantum attack and supports the flexible threshold access policy.