Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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  • Article
    Edge Deletion Based Subgraph Hiding
    (World Scientific and Engineering Academy and Society, 2024) Tekin,L.; Bostanoglu,B.E.; 01. Izmir Institute of Technology
    Extracting subgraphs from graph data is a challenging and important subgraph mining task since they reveal valuable insights in many domains. However, in the data sharing scenario, some of the subgraphs might be considered as sensitive by the data owner and require hiding before publishing the data. Therefore, subgraph hiding is applied to the data so that when subgraph mining algorithms, such as frequent subgraph mining, subgraph counting, or subgraph matching, are executed on this published data, sensitive subgraphs will not appear. While protecting the privacy of the sensitive subgraphs through hiding, the side effects should be kept at a minimum. In this paper, we address the problem of hiding sensitive subgraphs on graph data and propose an Edge deletion-based heuristic (EDH) algorithm. We evaluate our algorithm using three graph datasets and compare the results with the previous vertex masking heuristic algorithms in terms of execution time and side effects in the context of frequent subgraph hiding. The experimental results demonstrate that the EDH is competitive concerning execution time and outperforms the existing masking heuristic algorithms in terms of side effects by reducing information loss of non-sensitive patterns significantly and not creating fake patterns. © 2024 World Scientific and Engineering Academy and Society. All rights reserved.
  • Article
    Location Aware Self-Adapting Firewall Policies
    (World Scientific and Engineering Academy and Society, 2008) Tuğlular, Tuğkan; Tuğlular, Tuğkan; 03.04. Department of Computer Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Private access to corporate servers from Internet can be achieved using various security mechanisms. This article presents a network access control mechanism that employs a policy management architecture empowered with dynamic firewalls. With the existence of such an architecture, system and/or network administrators do not need to reconfigure firewalls when there is a location change in user settings, reconfiguration will be automatic and seamless. The proposed architecture utilizes dynamic firewalls, which adapt their policies according to user locations through the guidance of a policy server. This architecture is composed of a VPN client at user site, a domain firewall with VPN capabilities, a policy server containing a policy decision engine, and policy agents residing in dynamic firewalls, which map policy server decisions to firewall policy rules, at server site.