Welcome to the resource topic for 2018/114
Title:
Offline Assisted Group Key Exchange
Authors: Colin Boyd, Gareth T. Davies, Kristian Gjøsteen, Yao Jiang
Abstract:We design a group key exchange protocol with forward secrecy where most of the participants remain offline until they wish to compute the key. This is well suited to a cloud storage environment where users are often offline, but have online access to the server which can assist in key exchange. We define and instantiate a new primitive, a blinded KEM, which we show can be used in a natural way as part of our generic protocol construction. Our new protocol has a security proof based on a well-known model for group key exchange. Our protocol is efficient, requiring Diffie-Hellman with a handful of standard public key operations per user in our concrete instantiation.
ePrint: https://eprint.iacr.org/2018/114
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