4 Dec
2023
4 Dec
'23
2:53 p.m.
Bonjour tout le monde,
Dans le cadre des séminaires de l'équipe Sécurité /Systèmes, nous écouterons Yackolley
Amoussou-Guenou, MCF à l'Université Paris-Panthéon-Assas et le centre de recherche
CRED, jeudi 07/12/2023 à 10h30.
Yackolley Amoussou-Gueno nous parlera de ses travaux sur "Ethereum Proof-of-Stake
under Scrutiny".
Résumé :
Ethereum has undergone a recent change called the Merge, which made Ethereum a
Proof-of-Stake blockchain shifting closer to BFT consensus. Ethereum, which wished to keep
the best of the two protocol designs (BFT and Nakomoto-style), now has a convoluted
consensus protocol as its core. The result is a blockchain being possibly produced in a
tree-like form while participants try to finalize blocks.
We categorize different attacks jeopardizing the liveness of the protocol. The Ethereum
community has responded by creating patches against some of them. We discovered a new
attack on the patched protocol.
To support our analysis, we propose a new high-level formalization of the properties of
liveness and availability of the Ethereum blockchain, and we provide a pseudo-code. We
believe this formalization to be helpful for other analyses as well. Our results yield
that the Ethereum Proof-of-Stake has safety but only probabilistic liveness. The
probability of the liveness is influenced by the parameter describing the time frame
allowed for validators to change their mind about the current main chain. Joint work with
Ulysse Pavloff and Sara Tucci-Piergiovanni (CEA-List, Université Paris-Saclay).
Bio :
Yackolley Amoussou-Guenou is associated professor (maître de conférences) in computer
science at Université Paris-Panthéon-Assas, in the CRED research center. He was previously
researcher at CEA-List, Université Paris-Saclay. He holds a PhD from Sorbonne Université
and a M.Sc. from Université Paris Cité (ex- Paris-Diderot), both degrees in theoretical
computer science.
He works on various aspects of distributed systems, and in particular on the blockchain
technologies: the consensus protocols, the distribution of rewards, and the use of game
theory to study the incentives. More generally, his research interests span from
distributed systems to algorithmic game theory and their combination.
Cordialement,
Ghada Gharbi
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