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Despite the best efforts of security researchers, sometimes the static nature of authorisation can cause unexpected risks for users working in a dynamically changing environment. Disasters, medical emergencies or time-critical events can all lead to situations where the ability to relax normal access rules can become critically important. This paper(More)
While security is a critical component of information systems, at times it can be frustrating for end users. Security systems exist to minimise the risks of allowing users to access and modify data, but rarely do they consider the risks of not granting access. This paper describes an access control system which is optimistic, i.e. it assumes accesses are(More)
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