Cryptography

Download e-book for kindle: Access Control in Data Management Systems by Elena Ferrari

By Elena Ferrari

ISBN-10: 1608453758

ISBN-13: 9781608453757

Entry keep watch over is likely one of the primary providers that any info administration method should still offer. Its major objective is to guard facts from unauthorized learn and write operations. this is often relatively an important in trendy open and interconnected international, the place every one type of details could be simply made to be had to a big consumer inhabitants, and the place a harm or misuse of knowledge can have unpredictable results that transcend the bounds the place info stay or were generated. This publication offers an outline of a number of the advancements in entry keep watch over for info administration platforms. Discretionary, vital, and role-based entry regulate could be mentioned, by means of surveying the main proper proposals and studying the advantages and downsides of every paradigm in view of the necessities of other program domain names. entry regulate mechanisms supplied by way of advertisement information administration structures are awarded and mentioned. ultimately, the final a part of the e-book is dedicated to dialogue of a few of the main not easy and cutting edge learn tendencies within the region of entry regulate, corresponding to these concerning the internet 2.0 revolution or to the Database as a carrier paradigm. This ebook is a precious reference for an heterogeneous viewers. it may be used as both a longer survey for those that have an interest in entry keep an eye on or as a reference booklet for senior undergraduate or graduate classes in info protection with a distinct specialise in entry keep watch over. it's also important for technologists, researchers, managers, and builders who need to know extra approximately entry keep watch over and similar rising developments.

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Keyword PUBLIC is a shortcut for all the users to which the privileges have been previously granted. Each user can only issue REVOKE commands referring to privileges he/she previously granted. A REVOKE command implies the revocation also of the grant option. 3 REVOKE update, insert ON Movies FROM Helen; REVOKE update ON Customers FROM Marc; REVOKE select ON Videos FROM Gena; The first command revokes Helen the authorization to insert and modify tuples in the Movies relation. It also revokes the privilege to authorize other users to perform such operations.

2003]; Jajodia et al. [2001]) with the aim of providing a flexible framework able to support multiple conflict resolution policies to be customized according to the environment. The importance of supporting negative authorizations has also been recognized by commercial DMSs. For instance, Microsoft SQL Server provides, in addition to the GRANT and REVOKE commands, the DENY command to be used for the specification of negative authorizations. , 1998a]. Traditional authorizations are valid from the time they are entered into the system, until they are explicitly removed.

Moreover, a privilege on a view is grantable only if the user holds this privilege with the grant option on each view/relation appearing in the CREATE VIEW command. As far as point (2) is concerned, it is well known that the SQL standard [ISO, 2003] puts some restrictions on the set of commands executable on a view. The rationale behind these restrictions is that it is not allowed to perform on a view operations that are not unequivocally mappable to the base relations over which the view has been defined.

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Access Control in Data Management Systems by Elena Ferrari


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