Data Diversity: An Approach to Software Fault Tolerance
IEEE Transactions on Computers - Fault-Tolerant Computing
Dependability of COTS Microkernel-Based Systems
IEEE Transactions on Computers - Special issue on fault-tolerant embedded systems
Computer
Protective Wrapper Development: A Case Study
ICCBSS '03 Proceedings of the Second International Conference on COTS-Based Software Systems
A Formal-Specification Based Approach for Protecting the Domain Name System
DSN '00 Proceedings of the 2000 International Conference on Dependable Systems and Networks (formerly FTCS-30 and DCCA-8)
Wrapping Windows NT Software for Robustness
FTCS '99 Proceedings of the Twenty-Ninth Annual International Symposium on Fault-Tolerant Computing
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System designers using off-the-shelf components (OTSCs), whose internals they cannot change, often use add-on “wrappers” to adapt the OTSCs' behaviour as required. In most cases, wrappers are used to change “functional” properties of the components they wrap. In this paper we discuss instead protective wrapping, the use of wrappers to improve the dependability – i.e., “non-functional” properties like availability, reliability, security, and/or safety – of a component and thus of a system. Wrappers can improve dependability by adding fault tolerance, e.g. graceful degradation, or error recovery mechanisms. We discuss the rational specification of such protective wrappers in view of system dependability requirements, and highlight some of the design trade-offs and uncertainties that affect system design with OTSCs and wrappers, and that differentiate it from other forms of fault-tolerant design.