An efficient and practical threshold gateway-oriented password-authenticated key exchange protocol in the standard model

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• 作者：Fushan Wei ; Jianfeng Ma ; Ruijie Zhang ; Chuangui Ma…
• 关键词：password ; key exchange ; gateway ; threshold ; provable security
• 刊名：SCIENCE CHINA Information Sciences
• 出版年：2017
• 出版时间：July 2017
• 年：2017
• 卷：60
• 期：7
• 全文大小：286 KB
• 刊物类别：Computer Science
• 刊物主题：Chinese Library of Science
  Information Systems and Communication Service
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1919
• 卷排序：60

文摘

With the assistance of an authentication server, a gateway-oriented password-authenticated key exchange (GPAKE) protocol can establish a common session key shared between a client and a gateway. Unfortunately, a GPAKE protocol becomes totally insecure if an adversary can compromise the authentication server and steal the passwords of the clients. In order to provide resilience against adversaries who can hack into the authentication server, we propose a threshold GPAKE protocol and then present its security proof in the standard model based on the hardness of the decisional Diffie-Hellman (DDH) problem. In our proposal, the password is shared among n authentication servers and is secure unless the adversary corrupts more than t+1 servers. Our protocol requires n > 3t servers to work. Compared with existing threshold PAKE protocols, our protocol maintains both stronger security and greater efficiency.