Download Architecting Dependable Systems by Paulo Esteves Veríssimo, Nuno Ferreira Neves, Miguel Pupo PDF

By Paulo Esteves Veríssimo, Nuno Ferreira Neves, Miguel Pupo Correia (auth.), Rogério de Lemos, Cristina Gacek, Alexander Romanovsky (eds.)

As software program platforms turn into an increasing number of ubiquitous, the problems of dependability develop into an increasing number of serious. provided that options to those concerns has to be deliberate at the start of the layout strategy, it truly is acceptable that those concerns be addressed on the architectural level.

This publication is galvanized by means of the ICSE 2002 Workshop on Architecting accountable platforms; it truly is dedicated to present issues suitable for making improvements to the state-of-the-art for architecting dependability. a few of the thirteen peer-reviewed papers awarded have been at the start provided on the workshop, others have been invited with a view to in attaining efficient and entire insurance of all correct facets. The papers are prepared in topical sections on

- architectures for dependability

- fault tolerance in software program architectures

- dependability research in software program architectures

- business experience.

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This can be generalised to any function, such as time-keeping, or failure detection. In that sense, a local trusted component would encapsulate, and supply in a trusted way, a set of functions, considered crucial for protocols and services having to execute in a hostile environment. g. smart cards, appliance boards) may serve to amplify the trustworthiness of these special components. In Figure 7a we see an example of an architecture featuring LTCs (local trusted components). Inter-component communication should 26 Paulo Esteves Ven'ssimo et al.

COCA uses replicated servers for availability and intrusion-tolerance. org/. 28 Paulo Esteves Veri'ssimo et al. certificates that it produces are signed using a threshold cryptography algorithm. COCA assumes an adversary takes a certain time to corrupt a number of servers, therefore from time to time keys are changed (proactive security). Replication is based on a Byzantine quorum system. 2 MAFTIA Malicious- and Accidental-Fault Tolerance for Internet Applications (MAFTIA)^ is a recently finished EU 1ST project with the general objective of systematically investigating the 'tolerance paradigm' for constructing large-scale dependable distributed applications.

Each commander controls his/her own part of the battlefield and can deploy troops, analyze a deployment strategy, and fransfer troops to and from other commanders. Additionally, each commander can view the status of other parts of the battlefield. Soldiers only interact with commanders, and can view the status of the segment of the battlefield in which they are located, receive direct orders from their commanders, and report updates on their own status. ^"•iminH<*r H»T''|iiirt«*r'' Fig. 1. TDS application distributed across multiple devices Figure 2 illustrates the architecture of TDS consisting of three subsystems, one for each type of user.

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