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Denial of service (DoS) attacks are arguably one of the most cumbersome problems in the Internet. This paper presents a distributed information system (over a set of completely connected servers) called Chameleon which is robust to DoS attacks on the nodes as well as the operations of the system. In particular, it allows nodes to efficiently look up and insert data items at any time, despite a powerful "past-insider adversary" which has complete knowledge of the system up to some time point t0doi:10.1145/1583991.1584064 dblp:conf/spaa/BaumgartSS09 fatcat:njkxpbb3yncu7g3xoud3wmgmkm