Fiche de KHACEF Kahina

Titre : Trade-off Between Security and Scalability in Blockchain Systems
Date : 9 décembre 2022
Heure: 15:00
Résumé : In order to maintain the required level of security, the proposed approach shows that the replication of Blockchain over the Peer_to_Peer network is minimized as the Blockchain’s length evolves according to a replication factor. Furthermore, a sharding protocol over the network is proposed to get access to the blockchain data based on historical transactions. The protocol reduces old blocks’ replication; these blocks can be discarded from specific nodes and stored by others. The nodes willing to store the coming blocks and their data are chosen randomly. The block header of each block is kept to achieve consensus. Next, we optimize the latest approach by choosing the entering nodes following the nodes’ capacities instead of randomly. The last part of this thesis is motivated by a security flaw in the design of the latest approach. We provide a theorem guaranteeing the security of the history maintenance mechanism against attacks.
Lieu : Universite Paris Descartes salle Turing au 7eme étage, 45 Rue des Saints-Pères, 75006 Paris