支持撤销的位置分层属性加密研究

Research on encryption of location hierarchical attributes supporting revocation

基于属性加密的位置分层访问方案允许用户依据自身情况灵活设置自己的位置访问信息,不仅解决了社交网络中位置共享问题,还在算法上进行改进使解密效率得以提升。但在系统运行过程中,存在用户有更正自己属性信息的需求或运行过程中部分私钥遭泄露的可能,因此支持撤销对于系统安全非常必要。基于此提出了一种支持撤销的位置分层属性加密方案,将部分解密运算外包给解密服务器,并结合了双因子身份认证的方法。该方案在减少用户计算代价的同时,提高了算法的安全性。

The location-based hierarchical access scheme based on attribute encryption allows users to flexibly set their own location access information according to their own situation.Not only solving the problem of location sharing in social networks,but also improving the algorithm to improve the decryption efficiency.However,during the operation of the system,there is a possibility that the user has corrected his own attribute information or the private key may be leaked during the operation,supporting the withdrawal is very necessary for system security.Based on this,this paper proposed a location hierarchical attribute encryption scheme supporting undo,which outsourced part of the decryption operation to the decryption server and combined the method of two-factor identity authentication.This solution reduces the user’s computational cost and improves the security of the algorithm.