자연주의적 탐구조사(Naturalistic Inquiry)

In this article we propose a standard for role-based access control (RBAC). Although RBAC models have received broad support as a generalized approach to access control, and are well recognized for their many advantages in performing large-scale authorization management, no single authoritative definition of RBAC exists today. This lack of a widely accepted model results in uncertainty and confusion about RBAC's utility and meaning. The standard proposed here seeks to resolve this situation by unifying ideas from a base of frequently referenced RBAC models, commercial products, and research prototypes. It is intended to serve as a foundation for product development, evaluation, and procurement specification. Although RBAC continues to evolve as users, researchers, and vendors gain experience with its application, we feel the features and components proposed in this standard represent a fundamental and stable set of mechanisms that may be enhanced by developers in further meeting the needs of their customers. As such, this document does not attempt to standardize RBAC features beyond those that have achieved acceptance in the commercial marketplace and research community, but instead focuses on defining a fundamental and stable set of RBAC components. This standard is organized into the RBAC Reference Model and the RBAC System and Administrative Functional Specification. The reference model defines the scope of features that comprise the standard and provides a consistent vocabulary in support of the specification. The RBAC System and Administrative Functional Specification defines functional requirements for administrative operations and queries for the creation, maintenance, and review of RBAC sets and relations, as well as for specifying system level functionality in support of session attribute management and an access control decision process.

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Proposed NIST standard for role-based access control

An automated communications system operates to transfer data, metadata and methods from a provider computer to a consumer computer through a communications network. The transferred information controls the communications relationship, including responses by the consumer computer, updating of information, and processes for future communications. Information which changes in the provider computer is automatically updated in the consumer computer through the communications system in order to maintain continuity of the relationship. Transfer of metadata and methods permits intelligent processing of information by the consumer computer and combined control by the provider and consumer of the types and content of information subsequently transferred. Object oriented processing is used for storage and transfer of information. The use of metadata and methods further allows for automating may of the actions underlying the communications, including communication acknowledgements and archiving of information. Service objects and partner servers provide specialized data, metadata, and methods to providers and consumers to automate many common communications services and transactions useful to both providers and consumers. A combination of the provider and consumer programs and databases allows for additional functionality, including coordination of multiple users for a single database.

Computer-based communication system and method using metadata defining a control-structure

Thank you for reading experimental and quasi experimental designs for research. Maybe you have knowledge that, people have search numerous times for their favorite readings like this experimental and quasi experimental designs for research, but end up in malicious downloads. Rather than reading a good book with a cup of tea in the afternoon, instead they cope with some infectious virus inside their laptop.

Experimental And Quasi Experimental Designs For Research

The objective of this paper is to give a comprehensive introduction to applied cryptography with an engineer or computer scientist in mind. The emphasis is on the knowledge needed to create practical systems which supports integrity, confidentiality, or authenticity. Topics covered includes an introduction to the concepts in cryptography, attacks against cryptographic systems, key use and handling, random bit generation, encryption modes, and message authentication codes. Recommendations on algorithms and further reading is given in the end of the paper. This paper should make the reader able to build, understand and evaluate system descriptions and designs based on the cryptographic components described in the paper.

[서평]「Applied Cryptography」

With the increase in information and data accessibility, there is a growing concern for security and privacy of data In large corporate Intranets, the insider attack is a major security problem Numerous studies have shown that unauthorized accesses, in particular by insiders, pose a major security threat for distributed enterprise environments This problem is highly magnified in a multi-domain environment that spans multiple enterprises collaborating to meet their business requirements The challenge is in developing new or extending existing security models for efficient security management and administration in multi-domain environments that allow extensive interoperation among individuals or systems belonging to different security domains
In this dissertation, we have addressed the issue of secure interoperation from policy management perspective In particular, we have developed a policy-based framework that allows secure information and resource sharing in multi-domain environments supporting both tightly-coupled and loosely-coupled collaborations The level of coupling in such environments is characterized by the degree of interoperation, the level of trust among domains, and the security, autonomy, and privacy requirements of the collaborating domains The proposed framework provides efficient solutions and strategies for ensuring secure interoperation in both tightly-coupled and loosely-coupled multi-domain environments This framework is designed for distributed systems that employ role based access control (RBAC) policies, and therefore addresses the secure interoperability requirements of emerging distributed application systems

Access control management and security in multi-domain collaborative environments

Advances in wireless technology and availability of portable devices with networking capabilities have enabled ubiquitous Web accessibility. This has created the need to provide advance Internet services to mobile users without causing service failures due to connection migration or handoffs. However, scarcity of wireless resources restricts the provision of multimedia services in wireless networks. We address the issue of managing wireless resources to support Web-based multimedia document services including MPEG-4-based applications, in wireless networks with a high degree of user mobility. In particular, we formulate the resource management problem in wireless networks as an optimization problem with an objective function comprising different quality of presentation parameters.

Wireless network resource management for Web-based multimedia document services

For pre-orchestrated multimedia documents, the important QoS parameters are bandwidth, jitter and reliability. A data network may employ a large number of service disciplines that provide guaranteed QoS. In this paper, we propose a network model, which we call the jitter graph, to capture the bandwidth, jitter and reliability of a large number of service disciplines. The significance of this model is that it abstracts the properties of the network, which allows the design of QoS routing protocols, resource allocation policies, and traffic regulation schemes that are independent of the specific properties of each node. Based on this model, we propose a traffic regulation scheme that reduces, and possibly eliminates, jitter introduced by any service discipline that can be abstracted by the jitter graph network model. The proposed traffic regulation scheme, together with jitter graph model, are analyzed and simulated based on an existing service discipline.

Network modeling and jitter control for multimedia communication over broadband network

An optical pipelined architecture for a multifunctional binary arithmetic unit is proposed. The approach may eliminate geometrical constraints experienced in conventional implementations, thereby facilitating direct microminiaturization. Issues addressed.

Design of a pipelined optical binary processor.

Proposes a communication model for pre-orchestrated multimedia information. The model is used to determine the optimal number of channels needed to transmit the multimedia information. Subsequently, the authors consider a channel-deficient system and prove that scheduling transmission of multimedia data in this system is an NP-hard problem. Accordingly, they propose a heuristic algorithm with complexity O(nlog nm), where n represents the number of data units to be communicated over m channels. >

Arif Ghafoor

Papers

Access control management and security in multi-domain collaborative environments

Wireless network resource management for Web-based multimedia document services

Network modeling and jitter control for multimedia communication over broadband network

Design of a pipelined optical binary processor.

Multichannel scheduling for communication of pre-orchestrated multimedia information (homogeneous channels case)