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The anomaly detection literature is abundant with offline methods, which require repeated access to data in memory, and impose impractical assumptions when applied to a streaming context. Existing online anomaly detection methods also…

Machine Learning · Computer Science 2025-05-16 Filippo Leveni , Guilherme Weigert Cassales , Bernhard Pfahringer , Albert Bifet , Giacomo Boracchi

The rapid increase in the use of IoT devices brings many benefits to the digital society, ranging from improved efficiency to higher productivity. However, the limited resources and the open nature of these devices make them vulnerable to…

Cryptography and Security · Computer Science 2021-09-07 Joseph Rose , Matthew Swann , Gueltoum Bendiab , Stavros Shiaeles , Nicholas Kolokotronis

From the identification of a drawback in the Isolation Forest (IF) algorithm that limits its use in the scope of anomaly detection, we propose two extensions that allow to firstly overcome the previously mention limitation and secondly to…

Machine Learning · Computer Science 2018-10-30 Pierre-François Marteau , Saeid Soheily-Khah , Nicolas Béchet

In this paper, the mathematical analysis of the Isolation Random Forest Method (IRF Method) for anomaly detection is presented. We show that the IRF space can be endowed with a probability induced by the Isolation Tree algorithm (iTree). In…

Methodology · Statistics 2022-05-05 Fernando A. Morales , Jorge M. Ramírez , Edgar A. Ramos

Industrial Information Technology (IT) infrastructures are often vulnerable to cyberattacks. To ensure security to the computer systems in an industrial environment, it is required to build effective intrusion detection systems to monitor…

Cryptography and Security · Computer Science 2021-04-28 Md Tahmid Rahman Laskar , Jimmy Huang , Vladan Smetana , Chris Stewart , Kees Pouw , Aijun An , Stephen Chan , Lei Liu

Outlier detection is an essential capability in safety-critical applications of supervised visual recognition. Most of the existing methods deliver best results by encouraging standard closed-set models to produce low-confidence predictions…

Computer Vision and Pattern Recognition · Computer Science 2024-09-10 Anja Delić , Matej Grcić , Siniša Šegvić

Anomaly detection is a fundamental problem in domains such as healthcare, manufacturing, and cybersecurity. This thesis proposes new unsupervised methods for anomaly detection in both structured and streaming data settings. In the first…

Machine Learning · Computer Science 2025-05-20 Filippo Leveni

The need to explain predictive models is well-established in modern machine learning. However, beyond model interpretability, understanding pre-processing methods is equally essential. Understanding how data modifications impact model…

Artificial Intelligence · Computer Science 2025-05-09 Matteo Ceschin , Leonardo Arrighi , Luca Longo , Sylvio Barbon Junior

Maintaining security in IoT systems depends on intrusion detection since these networks' sensitivity to cyber-attacks is growing. Based on the IoT23 dataset, this study explores the use of several Machine Learning (ML) and Deep Learning…

Cryptography and Security · Computer Science 2025-04-01 Md Ahnaf Akif

Anomaly detection is critical in various fields, including intrusion detection, health monitoring, fault diagnosis, and sensor network event detection. The isolation forest (or iForest) approach is a well-known technique for detecting…

Machine Learning · Computer Science 2021-10-06 Seemandhar Jain , Prarthi Jain , Abhishek Srivastava

Isolation forest (iForest) has been emerging as arguably the most popular anomaly detector in recent years due to its general effectiveness across different benchmarks and strong scalability. Nevertheless, its linear axis-parallel isolation…

Machine Learning · Computer Science 2023-06-12 Hongzuo Xu , Guansong Pang , Yijie Wang , Yongjun Wang

With the proliferation of the Internet and smart devices, IoT technology has seen significant advancements and has become an integral component of smart homes, urban security, smart logistics, and other sectors. IoT facilitates real-time…

Cryptography and Security · Computer Science 2024-12-12 Yining Pang , Chenghan Li

An application of software known as an Intrusion Detection System (IDS) employs machine algorithms to identify network intrusions. Selective logging, safeguarding privacy, reputation-based defense against numerous attacks, and dynamic…

Cryptography and Security · Computer Science 2025-06-24 Muhammad Zawad Mahmud , Samiha Islam , Shahran Rahman Alve , Al Jubayer Pial

The rapid growth of the Internet of Things (IoT) has revolutionized industries, enabling unprecedented connectivity and functionality. However, this expansion also increases vulnerabilities, exposing IoT networks to increasingly…

Cryptography and Security · Computer Science 2025-02-19 Md Ahnaf Akif , Ismail Butun , Andre Williams , Imadeldin Mahgoub

The widespread integration of new technologies in low-voltage distribution networks on the consumer side creates the need for distribution system operators to perform advanced real-time calculations to estimate network conditions. In recent…

Systems and Control · Electrical Eng. & Systems 2025-04-28 Petar Labura , Tomislav Antic , Tomislav Capuder

Unsupervised anomaly detection tackles the problem of finding anomalies inside datasets without the labels availability; since data tagging is typically hard or expensive to obtain, such approaches have seen huge applicability in recent…

Machine Learning · Computer Science 2021-12-01 Tommaso Barbariol , Gian Antonio Susto

The growing scale and sophistication of cyberattacks pose critical challenges to network security, particularly in detecting diverse intrusion types within imbalanced datasets. Traditional intrusion detection systems (IDS) often struggle to…

Cryptography and Security · Computer Science 2025-11-25 Nisith Dissanayake , Uthayasanker Thayasivam

Recently, federated learning frameworks such as Python TestBed for Federated Learning Algorithms and MicroPython TestBed for Federated Learning Algorithms have emerged to tackle user privacy concerns and efficiency in embedded systems. Even…

Machine Learning · Computer Science 2025-09-05 Pavle Vasiljevic , Milica Matic , Miroslav Popovic

Cyber attacks constitute a significant threat to organizations with implications ranging from economic, reputational, and legal consequences. As cybercriminals' techniques get sophisticated, information security professionals face a more…

Cryptography and Security · Computer Science 2021-04-01 Emrah Tufan , Cihangir Tezcan , Cengiz Acartürk

Jailbreak attacks designed to bypass safety mechanisms pose a serious threat by prompting LLMs to generate harmful or inappropriate content, despite alignment with ethical guidelines. Crafting universal filtering rules remains difficult due…

Cryptography and Security · Computer Science 2025-12-01 Lama Sleem , Jerome Francois , Lujun Li , Nathan Foucher , Niccolo Gentile , Radu State