A Practical and Secure-Fault-Tolerant Conferenc-Key Agreement Protocol
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چکیده
When a group of people wants to communicate securely over an open network, they run a conference-key protocol to establish a common conference key K such that all their communications thereafter are encrypted with the key K. In this paper we propose a practical and provably secure fault-tolerant conference-key agreement protocol under the authenticated broadcast channel model. The adversary that attacks our protocol can be either active or passive. An active adversary (malicious participant) tries to disrupt establishment of a common conference key among the honest participants, while a passive adversary tries to learn the conference key by listening to the communication of participants. We show that a passive adversary gets no information (zero knowledge) about the conference key established by the honest participants under the assumption of a variant Diffie-Hellman decision problem. We also show that the honest participants can agree on a common conference key no matter how many participants are malicious.
منابع مشابه
An Enhanced Fault-Tolerant Conference Key Agreement Protocol
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Article history: Secure communication is o Received 24 July 2007 Received in revised form 5 March 2008 Accepted 4 May 2008 Available online 18 May 2008
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تاریخ انتشار 2000