Browsing by Author "Alakoca, Hakan"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Publication
    Irs-aided communication systems in the presence of multiple eavesdroppers
    (Ieee, 2023-01-01) Namdar, Mustafa; Alakoca, Hakan; Ata, Serdar Özgür; Durak-Ata, Lütfiye; Basgümüş, Arif; BAŞGÜMÜŞ, ARİF; 0000-0002-0611-3220; 0000-0002-4368-2967; E-9497-2015; IWV-3354-2023; I-1158-2016; AAC-4912-2020
    In this study, the performance analysis of secrecy capacity and secrecy outage probability in the presence of multiple eavesdroppers that cooperate (colluding) and do not cooperate (non-colluding) with each other, respectively, is studied for the intelligent reflective surfaces (IRS) assisted communication system model in urban wireless networks. In both approaches, realistic security problems and solutions regarding the system model related to physical layer security for legitimate users, designed with the help of the IRS, are evaluated.
  • No Thumbnail Available
    Publication
    Metasurface manipulation attacks: Potential security threats of ris-aided 6g communications
    (IEEE-inst Electrical Electronics Engineers Inc, 2023-01-01) Alakoca, Hakan; Namdar, Mustafa; Aldırmaz-Çolak, Sultan; Başaran, Mehmet; Başgümüş, Arif; Durak-Ata, Lütfiye; Yanıkomeroğlu, Halim; BAŞGÜMÜŞ, ARİF; Bursa Uludağ Üniversitesi; E-9497-2015
    The physical layer security (PLS) of reconfigurable intelligent surfaces (RIS) is critical for providing secure and reliable communications in sixth generation (6G) wireless systems. This article contributes to a debate on many aspects of unique vulnerabilities that can arise in the PLS of RIS with malicious attacks on signal processing (SP) in 6G networks. We address and categorize future security threats in RIS-aided networks considering PLS aspects. Metasurface manipulation attacks (MSMA) are based on manipulating metasurface behavior for malicious purposes. In this study, we present the potential hostile activities of MSMA considering the impact of electromagnetic and time-frequency deterioration. In addition, we evaluate various interference-based MSMA and eavesdropping booster-based MSMA (EaB-MSMA), which are novel potential PLS attacks that involve manipulating phase shifting activity with SP on malicious RIS. We also compare performance degradation in the presence of hostile interference-based MSMA through the manipulation of maliciously configured RIS. Additionally, in the EaB-MSMA case, the loss of secrecy capacity is shown to be considerably greater in passive eavesdropping scenarios.