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In Usage CONtrol (UCON) access decisions rely on mutable attributes. A reference monitor should re-evaluate security policies each time when attributes change their values. Catching timely all attribute changes is a challenging issue, especially if the attribute provider and the reference monitor reside in different security domains. Some attribute changes might be missed, corrupted, and delayed. As a result, the reference monitor may erroneously grant the access to malicious users and forbiddoi:10.1109/crisis.2011.6061833 dblp:conf/crisis/KrautsevichLMY11 fatcat:ojfkglpsqbbtdceb7ufljyvcci