Download Distributed Computing: 21st International Symposium, DISC by Burkhard Monien, Karsten Tiemann (auth.), Andrzej Pelc PDF

By Burkhard Monien, Karsten Tiemann (auth.), Andrzej Pelc (eds.)

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Read or Download Distributed Computing: 21st International Symposium, DISC 2007, Lemesos, Cyprus, September 24-26, 2007. Proceedings PDF

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Extra info for Distributed Computing: 21st International Symposium, DISC 2007, Lemesos, Cyprus, September 24-26, 2007. Proceedings

Sample text

In these cases, the entire system may be temporarily exposed, with potentially severe consequences for its functionality if this exposure is abused. In the past insider attack model, we assume that an attacker has complete knowledge of the system up to some time step t0 that is not known to the system. It can use this knowledge to attack the system at any time point after t0 . Given n servers, we allow the attacker to generate any collection of lookup requests it likes, one per non-blocked server, including lookup requests to blocked or non-existing data, and to block any set of n servers for some sufficiently small constant 0 < < 1.

To answer this question, let us first formally define the attack model we will be focusing on in this paper. 1 The Past Insider Attack Model The past insider attack model is motivated by the fact that a large percentage of the security breaches in corporate systems have internal reasons, many of them being caused by human error or negligence or insider attacks. In these cases, the entire system may be temporarily exposed, with potentially severe consequences for its functionality if this exposure is abused.

Aspnes, and D. Eisenstat The results are depicted in Figure 2. As can be seen, it seems that the protocol generally leaves Θ(n1− ) leaders and completely converges in O(log n) time. Acknowledgments The second author would like to thank Joanna Ellman-Aspnes for suggestions that helped overcome an obstacle in the proof of the main lemma bounding convergence. The authors would like to thank the DISC 2007 reviewers for their helpful comments. References 1. : Computation in networks of passively mobile finite-state sensors.

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