可实现隐私保护的基于属性密文可搜索方案

Privacy protection attribute-based ciphertext search scheme

针对现有的基于属性的密文可搜索方案存在隐私泄露问题以及当授权用户不在线时如何安全有效地将密文以及搜索权限委托给其他人的问题进行了研究,将隐藏访问结构的基于属性密文可搜索方案与代理重加密技术融合,提出了具有部分隐藏访问结构的支持代理重加密功能的基于属性的密文检索方案。该方案不仅有效地解决了上述问题,而且还支持关键字的更新。最后在随机预言模型下基于DL(D-linear)假设和q-BDHE(decisional q-parallel bilinear Diffie-Hellman exponent)假设,证明了方案的安全性。

There are lots of drawbacks in existing attribute-based encryption with keyword search scheme,such as privacy disclosure issues and when the authorized user is offline how effectively delegate decrypt and search right to other people.In order to solve these problems,this paper proposed an attribute-based ciphertext search scheme with hidden access structures,which support proxy re-encryption function by combing attribute-based encryption with hidden access structures and proxy re-encryption technology.This scheme not only effectively solves the problems mentioned above,but also supports the update of keywords.Finally,under the random oracle model,the researchers proved the security of the scheme based on DL(D-linear)and q-BDHE(decisional q-parallel bilinear Diffie-Hellman exponent)hypothesis.