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Balancing robust security with strong privacy guarantees is critical for Risk-Based Adaptive Authentication (RBA), particularly in decentralized settings. Federated Learning (FL) offers a promising solution by enabling collaborative risk…

Cryptography and Security · Computer Science 2025-09-23 Yaser Baseri , Abdelhakim Senhaji Hafid , Dimitrios Makrakis , Hamidreza Fereidouni

Risk-based Authentication (RBA) is an adaptive security measure that improves the security of password-based authentication by protecting against credential stuffing, password guessing, or phishing attacks. RBA monitors extra features…

Cryptography and Security · Computer Science 2020-09-15 Stephan Wiefling , Tanvi Patil , Markus Dürmuth , Luigi Lo Iacono

Risk-based authentication (RBA) aims to protect users against attacks involving stolen passwords. RBA monitors features during login, and requests re-authentication when feature values widely differ from previously observed ones. It is…

Cryptography and Security · Computer Science 2022-11-11 Stephan Wiefling , Paul René Jørgensen , Sigurd Thunem , Luigi Lo Iacono

Risk-based authentication (RBA) extends authentication mechanisms to make them more robust against account takeover attacks, such as those using stolen passwords. RBA is recommended by NIST and NCSC to strengthen password-based…

Cryptography and Security · Computer Science 2023-01-05 Stephan Wiefling , Jan Tolsdorf , Luigi Lo Iacono

Risk-based authentication (RBA) is an adaptive security measure to strengthen password-based authentication. RBA monitors additional implicit features during password entry such as device or geolocation information, and requests additional…

Cryptography and Security · Computer Science 2020-03-18 Stephan Wiefling , Luigi Lo Iacono , Markus Dürmuth

Risk-based authentication (RBA) aims to strengthen password-based authentication rather than replacing it. RBA does this by monitoring and recording additional features during the login process. If feature values at login time differ…

Cryptography and Security · Computer Science 2021-10-26 Stephan Wiefling , Markus Dürmuth , Luigi Lo Iacono

User active authentication on mobile devices aims to learn a model that can correctly recognize the enrolled user based on device sensor information. Due to lack of negative class data, it is often modeled as a one-class classification…

Computer Vision and Pattern Recognition · Computer Science 2021-04-16 Poojan Oza , Vishal M. Patel

Risk-based authentication (RBA) aims to protect end-users against attacks involving stolen or otherwise guessed passwords without requiring a second authentication method all the time. Online services typically set limits on what is still…

Cryptography and Security · Computer Science 2023-08-30 Jan-Phillip Makowski , Daniela Pöhn

Risk-based authentication (RBA) is used in online services to protect user accounts from unauthorized takeover. RBA commonly uses contextual features that indicate a suspicious login attempt when the characteristic attributes of the login…

Cryptography and Security · Computer Science 2024-03-19 Andre Büttner , Andreas Thue Pedersen , Stephan Wiefling , Nils Gruschka , Luigi Lo Iacono

Risk-based Authentication (RBA) is an adaptive security measure to strengthen password-based authentication. RBA monitors additional features during login, and when observed feature values differ significantly from previously seen ones,…

Cryptography and Security · Computer Science 2020-10-02 Stephan Wiefling , Markus Dürmuth , Luigi Lo Iacono

Machine learning models used for distributed architectures consisting of servers and clients require large amounts of data to achieve high accuracy. Data obtained from clients are collected on a central server for model training. However,…

Cryptography and Security · Computer Science 2025-09-18 Ozer Ozturk , Busra Buyuktanir , Gozde Karatas Baydogmus , Kazim Yildiz

Online services have difficulties to replace passwords with more secure user authentication mechanisms, such as Two-Factor Authentication (2FA). This is partly due to the fact that users tend to reject such mechanisms in use cases outside…

Cryptography and Security · Computer Science 2023-03-23 Vincent Unsel , Stephan Wiefling , Nils Gruschka , Luigi Lo Iacono

Federated learning, as a promising machine learning approach, has emerged to leverage a distributed personalized dataset from a number of nodes, e.g., mobile devices, to improve performance while simultaneously providing privacy…

Cryptography and Security · Computer Science 2019-10-16 Jiawen Kang , Zehui Xiong , Dusit Niyato , Yuze Zou , Yang Zhang , Mohsen Guizani

In the growing world of artificial intelligence, federated learning is a distributed learning framework enhanced to preserve the privacy of individuals' data. Federated learning lays the groundwork for collaborative research in areas where…

Machine Learning · Computer Science 2023-11-21 Elaheh Jafarigol , Theodore Trafalis , Talayeh Razzaghi , Mona Zamankhani

The advent of Federated Learning (FL) as a distributed machine learning paradigm has introduced new cybersecurity challenges, notably adversarial attacks that threaten model integrity and participant privacy. This study proposes an…

Cryptography and Security · Computer Science 2024-03-18 Zahir Alsulaimawi

This paper proposes a data privacy protection framework based on federated learning, which aims to realize effective cross-domain data collaboration under the premise of ensuring data privacy through distributed learning. Federated learning…

Machine Learning · Computer Science 2025-04-02 Yiwei Zhang , Jie Liu , Jiawei Wang , Lu Dai , Fan Guo , Guohui Cai

Federated learning is an improved version of distributed machine learning that further offloads operations which would usually be performed by a central server. The server becomes more like an assistant coordinating clients to work together…

Distributed, Parallel, and Cluster Computing · Computer Science 2020-10-20 Sheng Shen , Tianqing Zhu , Di Wu , Wei Wang , Wanlei Zhou

The classical machine learning paradigm requires the aggregation of user data in a central location where machine learning practitioners can preprocess data, calculate features, tune models and evaluate performance. The advantage of this…

Federated learning is a decentralized machine learning paradigm that allows multiple clients to collaborate by leveraging local computational power and the models transmission. This method reduces the costs and privacy concerns associated…

Machine Learning · Computer Science 2023-07-03 Bipin Chhetri , Saroj Gopali , Rukayat Olapojoye , Samin Dehbash , Akbar Siami Namin

The rapid expansion of the Internet of Things (IoT) ecosystem has transformed various sectors but has also introduced significant cybersecurity challenges. Traditional centralized security methods often struggle to balance privacy…

Cryptography and Security · Computer Science 2025-02-18 Milad Rahmati
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