半自适应性安全的双方可否认属性加密方案

Semi-adaptive Secure Bi-deniable Attribute Based Encryption

可否认加密技术是防御窃听者主动胁迫攻击的有效手段,但少有支持双方可否认的加密方案.由于当前基于格的证明框架的限制,现有的格中双方可否认加密方案都只能实现选择性安全.针对此问题,本文基于LWE标准假设,提出了半自适应性安全的双方可否认属性加密方案.具体而言,把分支程序计算算法应用到基于属性的双透明集合方案.将两阶段抽样算法作为秘密钥生成过程的关键组成部分,改变加密算法加密属性的方式,推导出半自适应性安全的可否认加密方案.对方案的正确性和安全性进行了证明.

Deniable encryption is an effective means to defend against active coercion attacks by eavesdroppers.However,few deniable encryption schemes support bi-deniability.Due to the limitation of the current lattice-based proof framework,the existing lattice-based bi-deniable encryption schemes can only achieve selective security.To solve this problem,this paper proposes a semi-adaptive secure bi-deniable attribute based encryption scheme based on the LWE standard assumption.Specifically,this paper applies the branching program evaluation algorithm to attribute based bitranslucent set scheme.At the same time,the two-stage sampling algorithm is used as the key part of the secret key generation process,and the way of encrypting the attributes of the encryption algorithm is changed.Eventually,a semi-adaptive secure deniable encryption scheme is derived.The correctness and security of the scheme are proved in this paper.