Cost-Sensitive Access Control for Illegitimate Confidential Access by Insiders

Young-Woo Seo and Katia Sycara
IEEE International Conference on Intelligence and Security Informatics (ISI 2006), May, 2006, pp. 117-128.


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Abstract
In many organizations, it is common to control access to confidential information based on the need-to-know principle; The requests for access are authorized only if the content of the requested information is relevant to the requester?s current information analysis project. We formulate such content-based authorization, i.e. whether to accept or reject access requests as a binary classification problem. In contrast to the conventional error-minimizing classification, we handle this problem in a cost-sensitive learning framework in which the cost caused by incorrect decision is different according to the relative importance of the requested information. In particular, the cost (i.e., damaging effect) for a false positive (i.e., accepting an illegitimate request) is more expensive than that of false negative (i.e., rejecting a valid request). The former is a serious security problem because confidential information, which should not be revealed, can be accessed. From the comparison of the cost-sensitive classifiers with error-minimizing classifiers, we found that the costing with a logistic regression showed the best performance, in terms of the smallest cost paid, the lowest false positive rate, and the relatively low false negative rate.

Keywords
cost-sensitive learning, insider threat, security, machine learning

Notes
Associated Center(s) / Consortia: Center for Integrated Manfacturing Decision Systems
Associated Lab(s) / Group(s): Advanced Agent - Robotics Technology Lab
Number of pages: 12

Text Reference
Young-Woo Seo and Katia Sycara, "Cost-Sensitive Access Control for Illegitimate Confidential Access by Insiders," IEEE International Conference on Intelligence and Security Informatics (ISI 2006), May, 2006, pp. 117-128.

BibTeX Reference
@inproceedings{Seo_2006_5431,
   author = "Young-Woo Seo and Katia Sycara",
   editor = "Sharad Mehrotra, Daniel D. Zeng, Hsinchun Chen, Bhavani Thuraisingham, Fei-Yue Wang",
   title = "Cost-Sensitive Access Control for Illegitimate Confidential Access by Insiders",
   booktitle = "IEEE International Conference on Intelligence and Security Informatics (ISI 2006)",
   pages = "117-128",
   publisher = "Springer",
   month = "May",
   year = "2006",
}