A model of authorization for next-generation database systems
ACM Transactions on Database Systems (TODS)
Role-Based Access Control Models
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On specifying security policies for web documents with an XML-based language
SACMAT '01 Proceedings of the sixth ACM symposium on Access control models and technologies
Secure and selective dissemination of XML documents
ACM Transactions on Information and System Security (TISSEC)
Securing XML Documents with Author-X
IEEE Internet Computing
A Model for Evaluation and Administration of Security in Object-Oriented Databases
IEEE Transactions on Knowledge and Data Engineering
An Authorization Model for a Distributed Hypertext System
IEEE Transactions on Knowledge and Data Engineering
Tutorial 4: Directories: Managing Data for Networked Applications
ICDE '00 Proceedings of the 16th International Conference on Data Engineering
Database Security-Concepts, Approaches, and Challenges
IEEE Transactions on Dependable and Secure Computing
ACM Transactions on Information and System Security (TISSEC)
Decentralized authorization and data security in web content delivery
Proceedings of the 2007 ACM symposium on Applied computing
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Protection and secure exchange of Web documents is becoming a crucial need for many Internet-based applications. Securing Web documents entail addressing two main issues: confidentiality and integrity. Ensuring document confidentiality means that document contents can only be disclosed to subjects authorized according to specified security policies, whereas by document integrity we mean that the document contents are correct with respect to a given application domain and that the document contents are modified only by authorized subjects. While the problem of document confidentiality has been widely investigated in the literature, the problem of how to ensure that a document, when moving among different parties, is modified only according to the stated policies still lacks comprehensive solutions. In this paper we present a solution to this problem by proposing a model for specifying update policies, and an infrastructure supporting the specification and enforcement of these policies in a distributed and cooperative environment, in which subjects in different organizational roles can modify possibly different portions of the same document. The key aspect of our proposal is that, by using a combination of hash functions and digital signature techniques, we create a distributed environment that enables subjects, in most cases, to verify, upon receiving a document, whether the update operations performed on the document up to that point are correct with respect to the update policies, without interacting with the document server. Our approach is particularly suited for environments, such as mobile systems, pervasive systems, decentralized workflows, and peer-to-peer systems.