ACM Transactions on Database Systems (TODS)
Time, clocks, and the ordering of events in a distributed system
Communications of the ACM
Cryptography and data security
Cryptography and data security
Results of the IFIP WG 11.3 Workshop on Database Security V: Status and Prospects
Planar Lattice Security Structures for Multilevel Replicated Databases
Proceedings of the IFIP WG11.3 Working Conference on Database Security VII
On Transaction Processing for Multilevel Secure Replicated Databases
ESORICS '92 Proceedings of the Second European Symposium on Research in Computer Security
IEEE Transactions on Knowledge and Data Engineering
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We consider communication structures for event ordering algorithms in distributed environments where information flows only in one direction. Example applications are multilevel security and hierarchically decomposed databases. Although the most general one-directional communication structure is a partial order, partial orders do not enjoy the property of being consistently ordered, a formalization of the notion that local ordering decisions are ensured to be globally consistent. Our main result is that the crown-free property is necessary and sufficient for a communication structure to be consistently ordered. We discuss the computational complexity of detecting crowns and sketch typical applications.