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 structures develop into a growing number of ubiquitous, the problems of dependability turn into progressively more serious. on condition that strategies to those concerns needs to be deliberate before everything of the layout method, it really is applicable that those concerns be addressed on the architectural level.

This booklet is galvanized by way of the ICSE 2002 Workshop on Architecting in charge platforms; it truly is dedicated to present subject matters correct for bettering the cutting-edge for architecting dependability. a few of the thirteen peer-reviewed papers provided have been at first awarded on the workshop, others have been invited so that it will in achieving powerfuble and whole insurance of all correct elements. 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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The project developed an IT version of Enclaves, a middleware for supporting secure group applications in insecure networks, like the Internet [18]. IT-Enclaves has several leaders from which at most / out of n > 3 / -I-1 are allowed to be compromised. The leaders provide all group-management services: user authentication, member join and leave, group-key generation, distribution, and refreshment. Each member of the group is in contact with 2 / -|-1 leaders. COCA is an on-line certification-authority for local and wide-area networks [38].

Arbitrary failure assumptions adapt perfectly to the notion of maliciousness, but they are costly to handle, in terms of performance and complexity, and thus are not compatible with the user requirements of the vast majority of today's on-line applications. Note that the problem hes in how representative are our assumptions vis-avis what happens in reality. That is, a problem of coverage of our assumptions. So, how to proceed? 1 Arbitrary Failure Assumptions Consider operations of very high value and/or criticality, such as: financial transactions; contract signing; provision of long term credentials; state secrets.

IT protocols can combine extremely high efficiency with high resilience if supported by locally accessible trusted components. For example, the notion of security kernel in IT would correspond to a fail-controlled local subsystem trusted to execute a few security-related functions correctly, albeit immersed in the remaining environment, subjected to malicious faults. 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.

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