• Journal of Advanced Navigation Technology
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• v.13 no.4
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• pp.586-599
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• 2009

Recently, a lot of nations are establish and researches the u-City which ubiquitous technology based city, and u-City Management Center(UMC) is also establish and researches. Technical researches of UMC are increasing. However, administrator privilege management researches for UMC is not enough. If we don't manage to administrator privilege who can access and control all of information in UMC, security problems will be occurs. Therefore, in this paper, analyses of administrator privilege management security problems, and proposed administrator privilege management system classification.

• KIPS Transactions on Computer and Communication Systems
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• v.9 no.7
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• pp.149-156
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• 2020

All operating systems have privileged administrator accounts for efficient management. Dangerous or sensitive tasks or resources should be banned from normal users and should only be accessible by administrators. One example of this privilege is to reset a user's password when the user loses his/her password. In this paper, the privileges of the sudoer group, the administrator group of Linux Ubuntu, and the management system of the sudoer group were analyzed. We show the danger that a sudoer can use the privilege to change the password of other users, including other sudoers, and modify the log, and suggest a countermeasure to prevent the manipulation of shadow files as a solution to this. In addition, the proposed method was implemented and the possibility of practical use was confirmed with excellent performance.