Titlebook: Verletzungen der intrakraniellen Schlagadern; Walter Krauland Book 1982 Springer-Verlag Berlin Heidelberg 1982 Anatomie.Aneurysma.Arterie.

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Hierarchical Attribute-Based Encryption Scheme Supporting Computing Outsourcing and Time-Limited Acc validity and significantly improve data security. In addition, all attributes are divided into attribute trees. According to the hierarchical relationship between attributes, we judge the user‘s access privilege. Finally, we give security proof, performance cost, functional comparison of the scheme.

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