演讲摘要：Distributed Hash Tables (DHTs) are a widely-used building block for large-scale distributed systems.  They efficiently route requests over an overlay network to the node responsible for a given key.  A long-standing open problem with DHTs is defending against Sybil attack, in which an adversary creates many false identities in order to increase its influence and deny service to honest participants.Defending against this attack is challenging because (1) in an open network, creating many fake identities is inexpensive; (2) an attacker can subvert periodic routing table maintenance to increase its influence over time; and (3) specific keys can be targeted by clustering attacks.  As a result, without centralized admission control, existing DHTs cannot provide strong availability guarantees. This talk describes Whānau, a new DHT routing protocol, which is both efficient and strongly resistant to the Sybil attack.

Joint work with Chris Lesniewski-Laas.

主办单位：国际合作与交流处

承办单位：计算机系、校科协

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