Intrusion Tolerance
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Intrusion tolerance is a new approach that has slowly emerged during the past decade, and gained impressive momentum recently. Instead of trying to prevent every single intrusion, these are allowed, but tolerated: the system triggers mechanisms that prevent the intrusion from generating a system security failure.
The tolerance paradigm in security has deserved great attention recently. Namely: in Europe, the MAFTIA project (Malicious- and Accidental-Fault Tolerance for Internet Applications), which developed concepts and prototyped architectures; in the US, the OASIS program, which implemented several intrusion-tolerant systems.
