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Special Seminar - Gareth DaviesExport this event to calendar

Friday, October 12, 2018 — 10:30 AM EDT

Title: Offline Assisted Group Key Exchange

Speaker: Gareth Davies
Affiliation: Norwegian University of Science and Technology (NTNU)
Room: MC 5417

Abstract:

This talk will focus on the problem of forward secrecy in group key exchange (GKE), where most of the participants remain offline until they wish to compute the key. We give a a protocol for such a GKE that is well suited to a cloud storage environment: users are often offline, but have online access to the server which can assist in key exchange. To meet the scenario requirements 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 protocol construction is provably secure in a well-known model for group key exchange, and is additionally efficient when implemented using our concrete instantiation. The talk will close with a discussion of the role of forward secrecy in group key exchange protocols, with a focus on practical application scenarios.

Joint work with Colin Boyd, Kristian Gjøsteen and Yao Jiang; to appear at ISC 2018; IACR ePrint 2018/114.

Location 
MC - Mathematics & Computer Building
5417
200 University Avenue West
Waterloo, ON N2L 3G1
Canada

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