The increased use of ubiquitous computing devices is resulting in networks that are highly mobile, well connected and growing in processing and storage capabilities. The nature of these ubiquitous systems, however, also increases the risk of building systems that are undependable and potentially insecure. This paper investigates the use of autonomous agents combined with an intrusion tolerance technique for providing secure and dependable storage for ad hoc networks. The proposed approach is based on the fragmentation-redundancy- scattering (FRS) technique that is able to tolerate both accidental and intentional faults by fragmenting confidential information into insignificant fragments, and by scattering these fragments in a redundant fashion across a network. Two algorithms that are able to maintain a constant number of fragments replicas were developed for this study: one based on the game of life, and the other based on roaming ants. Both algorithms were simulated in NetLogo, and simulated further in a cluster of computers for evaluation of their scalability. © Springer-Verlag Berlin Heidelberg 2007.
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