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- W1564893486 abstract "In this paper, we study the problem of perfectly reliable message transmission(PRMT) and perfectly secure message transmission(PSMT) between a sender S and a receiver R in an undirected synchronous network, tolerating a mixed where the adversary can be either or mobile. The connectivity requirement, phase complexityand communication complexityare three important parameters of any interactive PRMT/PSMT protocol and are well studied in the literature in the presence of a static/mobile However, in the presence of a mixed we encounter several surprising consequences. In this paper, we prove that even though the connectivity requirement for PRMT is same against both and mobile mixed the lower bound on communication complexity for PRMT tolerating a mobile mixed adversary is more than its mixed counterpart. This is interesting because against a Byzantine adversary, the connectivity requirement and the lower bound on the communication complexity of PRMT protocols are same for both and mobile case. Thus our result shows that for PRMT, a mobile mixed adversary is more powerful than its counterpart. As our second contribution, we design a four phase communication optimal PSMT protocol tolerating a static mixed adversary. Comparing this with the existing three phase communication optimal PSMT protocol against a static adversary, we find that additional one phase is enough to design communication optimal protocol against a mixed Finally, we show that the connectivity requirement and lower bound on communication complexity of any PSMT protocol is same against both and mobile mixed thus proving that mobility of the adversary has no effect on PSMT. To show that our bound is tight, we also present a worst case nine phase communication optimal PSMT protocol tolerating a mobile mixed adversary which is first of it's kind. This also shows that the mobility of the adversary does not hinder to design constant phase communication optimal PSMT protocol. In our protocols, we have used new techniques which can be effectively used against both and mobile mixed adversary and are of independent interest." @default.
- W1564893486 created "2016-06-24" @default.
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- W1564893486 date "2008-08-12" @default.
- W1564893486 modified "2023-09-26" @default.
- W1564893486 title "Perfectly Reliable and Secure Communication Tolerating Static and Mobile Mixed Adversary" @default.
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- W1564893486 doi "https://doi.org/10.1007/978-3-540-85093-9_15" @default.
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