Key management for content access control in a hierarchy
Computer Networks: The International Journal of Computer and Telecommunications Networking
Encryption policies for regulating access to outsourced data
ACM Transactions on Database Systems (TODS)
Data privacy - problems and solutions
ICISS'07 Proceedings of the 3rd international conference on Information systems security
An efficient key management scheme for content access control for linear hierarchies
Computer Networks: The International Journal of Computer and Telecommunications Networking
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The design of a secure file system based on user controlled cryptographic (UCC) transformations is investigated. With UCC transformations, cryptography not only complements other protection mechanisms, but can also enforce protection specifications. Files with different access permissions are enciphered by different cryptographic keys supplied by authorized users at access time. Several classes of protection policies such as: compartmentalized, hierarchical, and data dependent are discussed. Several protection implementation schemes are suggested and analyzed according to criteria such as: security, efficiency, and user convenience. These schemes provide a versatile and powerful set of design alternatives.