Privacy-Preserving Iris Recognition
Published:
Homomorphically encrypted iris identification performing 1:N matching directly over encrypted biometric templates, developed during my PhD at Imperial College London.
Posts by Collection
portfolio
Privacy-Preserving Information Sharing in P2P Environments
Published:
Presented at the Imperial Computing Conference (ICC), Imperial College London.
Reputation, Trust, and Privacy in the Sharing Economy: A Network Science Approach
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Sentiment and regression analysis of multivariate social media data, with the Financial Computing & Analytics Group, UCL.
Trust Issues in the Sharing Economy: A Study Based on Sentiment Analysis in Social Networks
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Master’s thesis, University of Patras, Greece (2018).
publications
Privacy-Preserving Iris Recognition: Performance Challenges and Outlook
Published in arXiv preprint arXiv:2603.26890, 2026
A study of the performance challenges in privacy-preserving iris recognition, with an outlook on practical encrypted-domain biometric matching.
Recommended citation: Karakosta, C., Alhedaithy, L., & Knottenbelt, W. J. (2026). "Privacy-preserving iris recognition: Performance challenges and outlook." arXiv preprint arXiv:2603.26890.
Download Paper | Download Bibtex
Iris Through the Looking Glass: Filter-Based Privacy-Preserving Identification
Published in 2026 14th International Workshop on Biometrics and Forensics (IWBF), 2026
A filter-based approach to privacy-preserving iris identification, performing 1:N matching over encrypted biometric data.
Recommended citation: Karakosta, C., & Knottenbelt, W. J. (2026). "Iris Through the Looking Glass: Filter-Based Privacy-Preserving Identification." In 2026 14th International Workshop on Biometrics and Forensics (IWBF) (pp. 1-6). IEEE.
Download Paper | Download Bibtex
talks
Named Splunk PhD Scholar
Published:
Named a Splunk PhD Scholar, supporting PhD talent in Imperial’s Department of Computing.
Attended NeurIPS 2020
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Attended the Thirty-fourth Conference on Neural Information Processing Systems (NeurIPS 2020), held virtually.
Attended WEIS 2020
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Attended the 20th Annual Workshop on the Economics of Information Security (WEIS 2020), held virtually.
Attended PETS 2021
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Attended the 21st Privacy Enhancing Technologies Symposium (PETS 2021), held virtually.
Attended BRAINS 2021
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Attended the 3rd Conference on Blockchain Research & Applications for Innovative Networks and Services (BRAINS 2021), held virtually.
Awarded IEEE S&P Student Travel Grant
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Received the IEEE S&P Student Travel Grant to attend the 43rd IEEE Symposium on Security and Privacy, held at the Hyatt Regency in San Francisco, CA.
Attended IEEE Symposium on Security and Privacy 2022
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Attended the 43rd IEEE Symposium on Security and Privacy in San Francisco, CA.
Poster Presentation at Imperial Computing Conference (ICC)
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Poster presentation on “Privacy-Preserving Information Sharing in P2P Environments” at the Imperial Computing Conference (ICC) in London, UK.
Attended MARBLE 2022
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Attended the 3rd International Conference on Mathematical Research for Blockchain Economy (MARBLE 2022) in Vilamoura, Portugal.
Talk at Women in Computing Panel (Imperial x King’s)
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Presentation and talk at the Female PhD Research Panel at Breaking the Code: Women in Computing Imperial x King’s in London, UK.
Awarded 2023 IPFS Thing Scholarship
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Received the 2023 IPFS Thing Scholarship to attend the InterPlanetary File System Thing (IPFS-Thing 2023).
Attended IPFS-Thing 2023
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Attended the InterPlanetary File System Thing (IPFS-Thing 2023) in Brussels, Belgium.
Awarded 2023 PETS Scholarship
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Received the 2023 PETS Scholarship to attend the 23rd Privacy Enhancing Technologies Symposium (PETS 2023).
Attended PETS 2023
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Attended the 23rd Privacy Enhancing Technologies Symposium (PETS 2023) in Lausanne, Switzerland.
Attended MARBLE 2024
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Attended the 5th International Conference on Mathematical Research for Blockchain Economy (MARBLE 2024) in Malaga, Spain.
Paper Presented at the 21st IFIP Summer School on Privacy and Identity Management
Published:
Presented our paper “Privacy-preserving iris recognition: Performance challenges and outlook” at the 21st IFIP Summer School on Privacy and Identity Management, held in Copenhagen, Denmark, 19–22 August 2025.
Paper Presented at IWBF 2026
Published:
Presented our paper “Iris Through the Looking Glass: Filter-Based Privacy-Preserving Identification” at the 14th International Workshop on Biometrics and Forensics (IWBF 2026), held at EURECOM, Côte d’Azur, France, 23–24 April 2026.
Successfully Defended My PhD
Published:
Successfully defended my PhD thesis on “Privacy-Preserving Iris Recognition: A Fully Homomorphic Encryption Framework with Candidate Filtering” and passed with minor corrections!
teaching
Introduction to Machine Learning (COMP97101/97151)
Postgraduate course, Imperial College London, Department of Computing, 2020
Coursework Marker and Tutorial Helper. Autumn term - Academic Year 2020-21. Lecturers: Dr Marek Rei, Dr Josiah Wang, and Dr Antoine Cully.
Natural Language Processing (COMP70016)
Postgraduate course, Imperial College London, Department of Computing, 2021
Coursework Marker and Tutorial Helper. Spring term - Academic Year 2020-21. Lecturers: Prof Lucia Specia and Dr Marek Rei.
Introduction to Machine Learning (COMP97101/97151)
Postgraduate course, Imperial College London, Department of Computing, 2021
Coursework Marker and Tutorial Helper. Autumn term - Academic Year 2021-2022. Lecturers: Dr Marek Rei, Dr Josiah Wang, and Dr Antoine Cully.
Cryptography Engineering (COMP70009)
Postgraduate course, Imperial College London, Department of Computing, 2022
Final Exam Marker, Coursework Marker and Tutorial Helper. Spring term - Academic Year 2021-2022 Lecturer: Prof Michael Huth.
Principles of Finance
Postgraduate course, Imperial College Business School, 2022
Final Exam Marker, Coursework Marker and Tutorial Helper. Autumn term - Academic Year 2022-2023.