Stefanos Koffas

36 papers A* 2A 2Misc 2Journal 22Unranked 8

Year	Rank	Type	Title / Venue / Authors
2026	—	`conf`	Dr. Jekyll and Mr. Hyde: Two Faces of LLMs. ITASEC/SERICS Matteo Gioele Collu, Tom Janssen-Groesbeek, Stefanos Koffas, Mauro Conti, Stjepan Picek
2026	J	`jnl`	Removing the Trigger, Not the Backdoor: Alternative Triggers and Latent Backdoors. CoRR Gorka Abad, Ermes Franch, Stefanos Koffas, Stjepan Picek
2025	J	`jnl`	CatBack: Universal Backdoor Attacks on Tabular Data via Categorical Encoding. CoRR Behrad Tajalli, Stefanos Koffas, Stjepan Picek
2025	Misc	`conf`	L ICASSP Simen Gaure, Stefanos Koffas, Stjepan Picek, Sondre Rønjom
2025	J	`jnl`	SoK: The Last Line of Defense: On Backdoor Defense Evaluation. CoRR Gorka Abad, Marina Krcek, Stefanos Koffas, Behrad Tajalli, Marco Arazzi, Roberto Riaño, Xiaoyun Xu, Zhuoran Liu, Antonino Nocera, Stjepan Picek
2025	A*	`conf`	Towards Backdoor Stealthiness in Model Parameter Space. CCS Xiaoyun Xu, Zhuoran Liu, Stefanos Koffas, Stjepan Picek
2025	J	`jnl`	Towards Backdoor Stealthiness in Model Parameter Space. CoRR Xiaoyun Xu, Zhuoran Liu, Stefanos Koffas, Stjepan Picek
2024	A*	`conf`	BAN: Detecting Backdoors Activated by Adversarial Neuron Noise. NeurIPS Xiaoyun Xu, Zhuoran Liu, Stefanos Koffas, Shujian Yu, Stjepan Picek
2024	J	`jnl`	BAN: Detecting Backdoors Activated by Adversarial Neuron Noise. CoRR Xiaoyun Xu, Zhuoran Liu, Stefanos Koffas, Shujian Yu, Stjepan Picek
2024	—	`conf`	Backdoors on Manifold Learning. WiseML@WiSec Christina Kreza, Stefanos Koffas, Behrad Tajalli, Mauro Conti, Stjepan Picek
2024	—	`conf`	Beyond PhantomSponges: Enhancing Sponge Attack on Object Detection Models. WiseML@WiSec Coen Schoof, Stefanos Koffas, Mauro Conti, Stjepan Picek
2024	—	`conf`	ELMs Under Siege: A Study on Backdoor Attacks on Extreme Learning Machines. AISec@CCS Behrad Tajalli, Stefanos Koffas, Gorka Abad, Stjepan Picek
2024	—	`conf`	EmoBack: Backdoor Attacks Against Speaker Identification Using Emotional Prosody. AISec@CCS Coen Schoof, Stefanos Koffas, Mauro Conti, Stjepan Picek
2024	J	`jnl`	EmoBack: Backdoor Attacks Against Speaker Identification Using Emotional Prosody. CoRR Coen Schoof, Stefanos Koffas, Mauro Conti, Stjepan Picek
2024	J	`jnl`	L CoRR Simen Gaure, Stefanos Koffas, Stjepan Picek, Sondre Rønjom
2024	J	`jnl`	Let's Focus: Focused Backdoor Attack against Federated Transfer Learning. CoRR Marco Arazzi, Stefanos Koffas, Antonino Nocera, Stjepan Picek
2024	J	`jnl`	The SpongeNet Attack: Sponge Weight Poisoning of Deep Neural Networks. CoRR Jona te Lintelo, Stefanos Koffas, Stjepan Picek
2024	J	`jnl`	Toward Stealthy Backdoor Attacks Against Speech Recognition via Elements of Sound. IEEE Trans. Inf. Forensics Secur. Hanbo Cai, Pengcheng Zhang, Hai Dong, Yan Xiao, Stefanos Koffas, Yiming Li
2024	J	`jnl`	Unveiling the Threat: Investigating Distributed and Centralized Backdoor Attacks in Federated Graph Neural Networks. DTRAP Jing Xu, Stefanos Koffas, Stjepan Picek
2023	J	`jnl`	A Systematic Evaluation of Backdoor Trigger Characteristics in Image Classification. CoRR Gorka Abad, Jing Xu, Stefanos Koffas, Behrad Tajalli, Stjepan Picek
2023	J	`jnl`	Backdoor Pony: Evaluating backdoor attacks and defenses in different domains. SoftwareX Arthur Mercier, Nikita Smolin, Oliver Sihlovec, Stefanos Koffas, Stjepan Picek
2023	J	`jnl`	BlindSage: Label Inference Attacks against Node-level Vertical Federated Graph Neural Networks. CoRR Marco Arazzi, Mauro Conti, Stefanos Koffas, Marina Krcek, Antonino Nocera, Stjepan Picek, Jing Xu
2023	J	`jnl`	Dr. Jekyll and Mr. Hyde: Two Faces of LLMs. CoRR Matteo Gioele Collu, Tom Janssen-Groesbeek, Stefanos Koffas, Mauro Conti, Stjepan Picek
2023	Misc	`conf`	Going in Style: Audio Backdoors Through Stylistic Transformations. ICASSP Stefanos Koffas, Luca Pajola, Stjepan Picek, Mauro Conti
2023	J	`jnl`	Invisible Threats: Backdoor Attack in OCR Systems. CoRR Mauro Conti, Nicola Farronato, Stefanos Koffas, Luca Pajola, Stjepan Picek
2023	J	`jnl`	On the Effect of Clock Frequency on Voltage and Electromagnetic Fault Injection. CoRR Stefanos Koffas, Praveen Kumar Vadnala
2023	J	`jnl`	Tabdoor: Backdoor Vulnerabilities in Transformer-based Neural Networks for Tabular Data. CoRR Bart Pleiter, Behrad Tajalli, Stefanos Koffas, Gorka Abad, Jing Xu, Martha A. Larson, Stjepan Picek
2023	J	`jnl`	Towards Stealthy Backdoor Attacks against Speech Recognition via Elements of Sound. CoRR Hanbo Cai, Pengcheng Zhang, Hai Dong, Yan Xiao, Stefanos Koffas, Yiming Li
2023	A	`conf`	Watermarking Graph Neural Networks based on Backdoor Attacks. EuroS&P Jing Xu, Stefanos Koffas, Oguzhan Ersoy, Stjepan Picek
2022	—	`conf`	Can You Hear It?: Backdoor Attacks via Ultrasonic Triggers. WiseML@WiSec Stefanos Koffas, Jing Xu, Mauro Conti, Stjepan Picek
2022	—	`conf`	Dynamic Backdoors with Global Average Pooling. AICAS Stefanos Koffas, Stjepan Picek, Mauro Conti
2022	J	`jnl`	Dynamic Backdoors with Global Average Pooling. CoRR Stefanos Koffas, Stjepan Picek, Mauro Conti
2022	J	`jnl`	Going In Style: Audio Backdoors Through Stylistic Transformations. CoRR Stefanos Koffas, Luca Pajola, Stjepan Picek, Mauro Conti
2022	A	`conf`	More is Better (Mostly): On the Backdoor Attacks in Federated Graph Neural Networks. ACSAC Jing Xu, Rui Wang, Stefanos Koffas, Kaitai Liang, Stjepan Picek
2022	—	`conf`	On the Effect of Clock Frequency on Voltage and Electromagnetic Fault Injection. ACNS Workshops Stefanos Koffas, Praveen Kumar Vadnala
2021	J	`jnl`	Can You Hear It? Backdoor Attacks via Ultrasonic Triggers. CoRR Stefanos Koffas, Jing Xu, Mauro Conti, Stjepan Picek