Publications in International Journals 

• Polenakis, I., Vouronikos, V., Merolli, A., Nikolopoulos, S.D., :A PDF watermarking scheme utilizing invisible QR code embedding in the spatial domain, Journal of Computer Security, (0926227X251346082), SAGE Publications, 2025.
  
  

• Chysi, A., Nikolopoulos, S. D., and Polenakis, I.: Detection and classification of malicious software utilizing Max-Flows between system-call groups. Journal of Computer Virology and Hacking Techniques, 19(1), 97-123, Springer, 2023.
  
  

• Chondros, C., Nikolopoulos, S.D., and Polenakis, I.: An integrated simulation framework for the prevention and mitigation of pandemics caused by airborne pathogens. Network Modeling Analysis in Health Informatics and Bioinformatics, 11(1), 1-28, Springer, 2022. 
  
  

• Nikolopoulos, S.D., and Polenakis, I: Behavior-based detection and classification of malicious software utilizing structural characteristics of group sequence graphs. Journal of Computer Virology and Hacking Techniques, 18(4), 383-406, Springer, 2022.
  
  

• Dounavi, H. M., Mpanti, A., Nikolopoulos, S. D., and Polenakis, I.: A graph-based framework for malicious software detection and classification utilizing temporal-graphs, Journal of Computer Security, 1-38, IOSPress 2021.
  
  

• Nikolopoulos, S.D., and Polenakis, I.: Preventing malware pandemics in mobile devices by establishing response-time bounds. Journal of Information Security and Applications, 1-14, ELSEVIER, 2017.
  
  

• Nikolopoulos, S.D., and Polenakis, I.: A graph-based model for malware detection and classification using system-call groups. Journal of Computer Virology and Hacking Techniques, 13(1), 29-46, Springer, 2017. 

Publications in International Conferences 

• Polenakis,  I.,  Vouronikos,  V.,  Kiafa,  E.,  Chroni,  M.,  and  Nikolopoulos,  S.  D.:  ProtAIN:  Protecting  the Authenticity  and  Integrity  Properties  of  NFT  Images.  In  Proceedings  of  the  International  Conference  on Computer Systems and Technologies 2024 (pp. 16-23), ACM ICPS Proceedings, 2024. | ACM - BEST PAPER AWARD.
  
  

• Chroni, M., Nikolopoulos, S. D., Polenakis, I., and Vouronikos, V.: A Code-based Multiple Watermarking Scheme for  the  Preservation  of Authenticity  of  Forensic  Images.  In  Proceedings of  the  14 th   International  Conference  on Information, Intelligence, Systems & Applications (IISA), IEEE 2023.
  
  

• Chroni, M., Katsi, A., Nikolopoulos, S., Polenakis, I., & Vouronikos, V.: Tamper Detection and Localization in Forensic  Images.  In  Proceedings  of  the  24 th   International  Conference  on  Computer  Systems  and  Technologies (CompSysTech’23), (pp. 117-122), ACM ICPS Proceedings, 2023. | ACM - BEST PAPER AWARD.
  
  

• Chroni, M., Nikolopoulos, S. D., Polenakis, I., and Vouronikos, V: A Multiple Watermarking Scheme for Digital Audio  Signals.  In  Proceedings  of  the  26 th   Pan-Hellenic  Conference  on  Informatics  (pp.  279-284),  ACM,  2022.
  
  

• Grigoriadis-Kotsalis, G., Nikolopoulos, S. D., and Polenakis, I.: A Synonym-based Approach for the Semantic Indexing  of  Texts.  In  Proceedings  of  the  23 rd   International  Conference  on  Computer  Systems  and  Technologies (CompSysTech’22), ACM ICPS Proceedings, pp. 95-102, 2022.
  
  

• Chroni, M., Nikolopoulos, S. D., Polenakis, I., and Vouronikos, V.: A Repetitive Watermarking Scheme for Digital Images based  on Self-Inverting Permutations.  In  Proceedings of the  13 th   International  Conference on  Information, Intelligence, Systems & Applications (IISA)/ pp. 1-8, IEEE 2022.
  
  

• Chroni,  M.,  Nikolopoulos,  S.  D.,  Polenakis,  I.,  and  Vouronikos,  V.:  Digital  Image  Watermarking  using  Self Inverting Permutations-A Comparative Study. In  Proceedings of the  13 th  International  Conference on  Information, Intelligence, Systems & Applications (IISA)/ pp. 1-8, IEEE 2022.
  
  

• Dounavi, H. M., Mpanti, A., Nikolopoulos, S. D., and Polenakis, I.: Detection and Classification of Malicious Software based on Regional Matching of Temporal Graphs. In Proceedings of the 22 nd  International Conference on Computer Systems and Technologies (CompSysTech’21), ACM ICPS Proceedings, pp. 28-33, 2021 | ACM - BEST PAPER AWARD.
  
  

• Chysi, A., Nikolopoulos, S.D., and Polenakis, I.: An Algorithmic Framework for Malicious Software Detection Exploring Structural Characteristics of Behavioral Graphs. In Proceedings of the 21 st  International Conference on Computer Systems and Technologies (CompSysTech’20), ACM ICPS Proceedings, pp. 43-50, 2020.
  
  

• Mpanti, A., Nikolopoulos S.D., and Polenakis, I.: Malicious Software Detection utilizing Temporal Graphs. In Proceedings of the 20 th  International Conference on Computer Systems and Technologies (CompSysTech’19), ACM ICPS Proceedings, pp. 49-55, 2019.
  
  

• Mpanti,  A.,  Nikolopoulos,  S.D.,  and  Polenakis,  I.:  A  Graph-based  Model  for  Malicious  Software  Detection Exploiting Domination Relations between System-call Groups. In Proceedings of the 19 th  International Conference on Computer Systems and Technologies (CompSysTech’18), ACM ICPS Proceedings, pp. 20-26, 2018 |ACM - BEST PAPER AWARD. 
  
  

• Mpanti, A., Nikolopoulos, S.D., and Polenakis I.: Defending Hardware-based Attacks on Trusted Computing using a Hardware-Integrity Attestation Protocol. In Proceedings of the  18 th  International Conference on Computer Systems and Technologies (CompSysTech’17), ACM ICPS Proceedings, pp. 155-162, 2017.
  
  

• Nikolopoulos, S.D., and Polenakis, I.: A Model for Establishing Response-time Bounds to Prevent Malware Pandemics in Mobile Devices. In Proceedings of the 17 th  International Conference on Computer Systems and Technologies (CompSysTech’16), ACM ICPS Proceedings, pp. 97-104, 2016 | ACM - BEST PAPER AWARD. 
  
  

• Nikolopoulos, S. D., and Polenakis, I.: Malicious software classification based on relations of system-call groups. In Proceedings of the 19 th  Panhellenic Conference on Informatics (PCI’15), ACM ICPS Proceedings, pp. 59-60, 2015.
  
  

• Νikolopoulos, S.D., and Polenakis, I.: A graph-based model for malicious code detection exploiting dependencies of  system-call  groups.  In  Proceedings  of  the  16 th   International  Conference  on  Computer  Systems  and  Technologies (CompSysTech’15), ACM ICPS Proceedings, pp. 228-235, 2015 | ACM - BEST PAPER AWARD.
  
  

• Chionis, I., Nikolopoulos, S.D., and Polenakis, I.: A Survey on Algorithmic Techniques for Malware Detection, In Proceedings of the 2 nd  International Symposium on Computing in Informatics and Mathematics (ISCIM’13), 2013. 

Books and Volumes 

• Polenakis, I., Vouronikos, V., Vouronikos, N., Chroni, M., and Nikolopoulos, S. D.: A Code-Based Watermarking Scheme  for  the  Protection  of  Authenticity  of  Medical  Images.  In Optimization,  Discrete  Mathematics  and Applications to Data Sciences (pp. 175-209), Springer, 2024. 

Technical Reports 

• Polenakis, I., Vouronikos, V., Chroni, M., & Nikolopoulos, S. D. (2024). Towards a real-time distributed feedback system for the transportation assistance of PwD. arXiv preprint arXiv:2406.06154. 

• Chondros, C., Nikolopoulos, S. D., and Polenakis, I.: A Stochastic Graph-based Model for the Simulation of SARS-CoV-2 Transmission. arXiv preprint arXiv:2111.05802, 2021. 

• Chondros, C., Georgiou-Mousses, C., Nikolopoulos, S. D., Polenakis, I., and Vouronikos, V.: SARiSsa - A Mobile Application for the Proactive Control of SARS-CoV-2 Spread. arXiv preprint arXiv:2106.14567, 2021. 

• Mpanti,  A.,  Nikolopoulos,  S.D.,  and  Polenakis,  I.:  Malicious  Software  Detection  and  Classification  utilizing Temporal-Graphs of System-call Group Relations. arXiv preprint arXiv:1812.10748, 2018. 

• Nikolopoulos,  S.D.,  and  Polenakis,  I.:  Preventing  Malware  Pandemics  in  Mobile  Devices  by  Establishing Response-time Bounds. arXiv preprint arXiv:1607.00827, 2016. 

• Nikolopoulos, S.D., and Polenakis, I.: Detecting malicious code by exploiting dependencies of system-call groups. arXiv preprint arXiv:1412.8712, 2014.