一个适用于云数据共享的高效代理广播重加密方案

An efficient proxy broadcast re-encryption scheme suitable for cloud data sharing

代理广播重加密(Proxy broadcast re-encryption,PBRE)允许委托者可以一次将解密权委托给一组用户,这是一种高效的加密方法。现有的PBRE方案中,大多数的PBRE方案使用了双线性配对运算,而没有使用双线性对的方案在安全性方面都只能达到选择明文攻击安全,因此我们提出了一个适用于云数据共享的不需要双线性对的PBRE方案,并证明了在标准模型下是选择密文攻击安全的;通过效率分析得出,与现存一些高效的方案比较,新的方案节约了71.5%的储存成本和81.9%的计算成本。

Proxy broadcast re-encryption(PBRE)allows a delegator to delegate decryption rights to a group of users at a time,which is an efficient encryption method.Most of the existing PBRE schemes use bilinear pairing operations,and the schemes that do not use bilinear pairs are only chosen-plaintext-attack secure in terms of security,so we propose a PBRE scheme that does not require bilinear pairs for cloud data sharing and prove that it is chosen-ciphertext-attack secure under the standard model;an efficiency analysis yields that,compared with some existing efficient schemes,the new scheme saves 71.5%of the storage cost and 81.9%of the computation cost.