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We present the design of an Identity-based CAPability protection system ICAP, which is aimed at a distributed system in a network environment. The semantics of traditional capabilities are modified to incorporate subject identities. This enables the monitoring, mediating, and recording of capability propagations to enforce security policies. It also supports administrative activities such as traceability. We have developed an exception list approach to achieve rapid revocation and the idea ofdoi:10.1109/secpri.1989.36277 dblp:conf/sp/Gong89 fatcat:htrfdghjmfge7mvn7pmtlqptqy