ISSN: 1690-4524 (Online)
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ABSTRACT
Implementation of Hierarchical Authorization For A Web-Based Digital Library Andreas Geyer-Schulz, Anke Thede
Access control mechanisms are needed in almost every system nowadays to control
what kind of access each user has to which resources and when. On the one hand
access control systems need to be flexible to allow the definition of the access rules
that are actually needed. But they must also be easy to administrate to prevent
rules from being in place without the administrator realizing it. This is
particularly difficult for systems such as a digital
library that requires fine-grained access rules specifying access control at a
document level. We present the implementation and architecture of a system that
allows definition of access rights down to the single document and user
level. We use hierarchies on users and roles, hierachies on access rights and
hierarchies on documents and document groups. These hierarchies allow a maximum
of flexibility and still keep the system easy enough to administrate. Our access
control system supports positive as well as negative permissions.
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