@article{(Open Science Index):https://publications.waset.org/pdf/9999650,
	  title     = {Component Lifecycle and Concurrency Model in Usage Control (UCON) System},
	  author    = {P. Ghann and  J. Shiguang and  C. Zhou},
	  country	= {},
	  institution	= {},
	  abstract     = {Access control is one of the most challenging issues
facing information security. Access control is defined as, the ability to
permit or deny access to a particular computational resource or digital
information by an unauthorized user or subject. The concept of usage
control (UCON) has been introduced as a unified approach to capture a
number of extensions for access control models and systems. In
UCON, an access decision is determined by three factors:
authorizations, obligations and conditions. Attribute mutability and
decision continuity are two distinct characteristics introduced by
UCON for the first time. An observation of UCON components
indicates that, the components are predefined and static. In this paper,
we propose a new and flexible model of usage control for the creation
and elimination of some of these components; for example new
objects, subjects, attributes and integrate these with the original
UCON model. We also propose a model for concurrent usage
scenarios in UCON.
	    journal   = {International Journal of Computer and Information Engineering},
	  volume    = {8},
	  number    = {3},
	  year      = {2014},
	  pages     = {531 - 538},
	  ee        = {https://publications.waset.org/pdf/9999650},
	  url   	= {https://publications.waset.org/vol/87},
	  bibsource = {https://publications.waset.org/},
	  issn  	= {eISSN: 1307-6892},
	  publisher = {World Academy of Science, Engineering and Technology},
	  index 	= {Open Science Index 87, 2014},