摘要： 针对数据共享过程中的密钥管理问题,借鉴基于多线性映射的广播加密方案思想,提出一种基于多线性映射的密钥聚合加密方案。将多个密钥聚合为一个单密钥,用户使用该密钥即可解密对应多个加密文件,从而简化用户密钥管理流程,实现云环境下安全高效的数据共享。基 于DHDHE假设证明了该方案在标准模型下具有非自适应不可区分选择明文攻击的语义安全,并且与现有加密方案相比,可有效减少存储和传输开销。

关键词: 云存储, 数据共享, 密钥聚合, 多线性映射, 标准模型

Abstract: Aiming at the key management problems during data sharing,this paper proposes a key-aggregate encryption scheme based on multilinear mapping through the idea of broadcast encryption scheme based on multilinear mapping.In the proposed scheme,user private keys can be aggregated together to generate a single key,and the single key can decrypt the corresponding multiple encrypted files.It simplifies the user key management and realizes data sharing securely and efficiently in cloud storage.The proposed scheme is proved security of selective Indistinguishability Under Chosen Plaintext Attack(IND-CPA) based on DHDHE assumption in the standard model.Compared with the existing schemes,the proposed scheme can save the cost of storage and transmission efficiently.

Key words: cloud storage, data sharing, key-aggregate, multilinear mapping, standard model

中图分类号: 

• TP309