NDLI: Authorization model for summary schemas model

Content Provider	IEEE Xplore Digital Library
Author	Ngamsuriyaroj, S. Hurson, A.R. Keefe, T.F.
Copyright Year	2002
Description	Author affiliation: Dept. of Comput. Sci. & Eng., Pennsylvania State Univ., University Park, PA, USA (Ngamsuriyaroj, S.; Hurson, A.R.)
Abstract	Security issues in multidatabases are complicated due to autonomy and heterogeneity of local databases. Deriving global authorizations by integrating underlying local authorizations is difficult since subjects and objects at each local database may not be compatible. In addition, local authorizations may conflict and could not be combined to form common global authorizations. This paper proposes an authorization model for a multidatabase system. The summary schemas model (SSM) is used as the underlying paradigm. The SSM resolves name differences in multidatabases using word relationships defined in a standard dictionary. Hypernyms and hyponyms of access terms exported from local databases are the main components of the SSM as they form a hierarchical metadata structure. SSM global authorizations tagged to hypernyms are derived from local authorizations using global roles and a role hierarchy defined in multidatabases. The model considers roles as common global subjects onto which local subjects can be mapped. Since the mapping can be done independently and autonomously among local databases, authorization autonomy is preserved. The paper also evaluates the performance of the proposed model. The simulation results show that the proposed model offers better performance than the original SSM since user queries with insufficient authority are rejected earlier. This results in less communication and less query response time.
Starting Page	182
Ending Page	191
File Size	304771
Page Count	10
File Format	PDF
ISBN	0769516386
ISSN	10988068
DOI	10.1109/IDEAS.2002.1029671
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-07-17
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Authorization Data models Data engineering Database languages Computer science Computer security Data security Dictionaries Delay Distributed databases
Content Type	Text
Resource Type	Article

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