可证安全的基于属性密钥交换

Provable Secure Key Exchange Based on Attribute

分析了密钥交换协议的特点,提出了一种基于属性的密钥交换协议,能够更灵活地控制不同用户参与密钥交换的权限,该协议基于Sahai-Waters ABE体制,只需要一轮消息通信。研究了密钥交换协议的安全需求,应用"敌手-挑战者"游戏,提出了基于属性密钥交换协议的语义安全性定义,进一步在标准模型中证明了协议的安全性。

With the extension of identity-based cryptography,the attribute-based encryption haas been used to control different authorities of decrypting a cipher-text among different users in a more flexible manner.Thus attribute-based encryption has become a hot research topic nowadays.With the development of attribute-based encryption,the attribute-based key exchange has also become a point which attracts a great deal of attention.The distinctive features of key exchange protocols are analyzed.An attribute-based key exchange based on Sahai-Waters attribute-based encryption is proposed,which can flexibly control the access authority of different users.The protocol requires only one round of message sending.Moreover,based on the security request of key exchange protocols,a new security definition for attribute-based key exchange protocol is given.The security of the protocol is proved with the standard model.