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2015
ACM

The Fairy-Ring Dance: Password Authenticated Key Exchange in a Group

4 years 9 months ago
The Fairy-Ring Dance: Password Authenticated Key Exchange in a Group
In this paper, we study Password Authenticated Key Exchange (PAKE) in a group. First, we present a generic “fairy-ring dance” construction that transforms any secure two-party PAKE scheme to a group PAKE protocol while preserving the round efficiency in the optimal way. Based on this generic construction, we present two concrete instantiations based on using SPEKE and J-PAKE as the underlying PAKE primitives respectively. The first protocol, called SPEKE+, accomplishes authenticated key exchange in a group with explicit key confirmation in just two rounds. This is more round-efficient than any existing group PAKE protocols in the literature. The second protocol, called J-PAKE+, requires one more round than SPEKE+, but is computationally faster. Finally, we present full implementations of SPEKE+ and J-PAKE+ with detailed performance measurements. Our experiments suggest that both protocols are feasible for practical applications in which the group size may vary from three to se...
Feng Hao, Xun Yi, Liqun Chen, Siamak Fayyaz Shahan
Added 17 Apr 2016
Updated 17 Apr 2016
Type Journal
Year 2015
Where CCS
Authors Feng Hao, Xun Yi, Liqun Chen, Siamak Fayyaz Shahandashti
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