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Hector Hougaard, Atsuko Miyaji, Authenticated Tree-Based R-LWE Group Key Exchange, The Computer Journal, Volume 66, Issue 2, February 2023, Pages 360–372, https://doi.org/10.1093/comjnl/bxab165
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Abstract
We present the first constant round, multicast, authenticated tree-based R-LWE group key exchange protocol with logarithmic communication and memory complexity. Our protocol achieves post-quantum security through a reduction to a Diffie–Hellman-like analogue to the decisional R-LWE problem. We also present a sequential version with constant memory complexity but a logarithmic number of rounds and communication complexity.
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