minimize Header

Kumar Ashutosh Anand, M.Sc.

Centre for Applied Research

TC Vilshofen

Academic Staff

ITC2+ 1.06

0991/3615-8234

publications

Sortierung:

Vortrag

Kumar Anand

Online Unsupervised Anomaly Detection with a Glance on XAI Aspects

In: Konferenz des berufsbegleitenden Masterstudiengangs Cybersecurity: Ausgewählte Themen der Security Forschung

Technische Hochschule Deggendorf (THD)/Technologie Campus Vilshofen Online

19.01.2023 (2023)

30 S: TC Vilshofen S_EN: TC Vilshofen
Institut ProtectIT
DIGITAL

Zeitschriftenartikel

Michael Heigl
Kumar Anand
Andreas Urmann
D. Fiala
Martin Schramm
Robert Hable

On the Improvement of the Isolation Forest Algorithm for Outlier Detection with Streaming Data

In: Electronics vol. 10 pg. 1534.

(2021)

DOI: 10.3390/electronics10131534

Abstract anzeigen

In recent years, detecting anomalies in real-world computer networks has become a more and more challenging task due to the steady increase of high-volume, high-speed and high-dimensional streaming data, for which ground truth information is not available. Efficient detection schemes applied on networked embedded devices need to be fast and memory-constrained, and must be capable of dealing with concept drifts when they occur. Different approaches for unsupervised online outlier detection have been designed to deal with these circumstances in order to reliably detect malicious activity. In this paper, we introduce a novel framework called PCB-iForest, which generalized, is able to incorporate any ensemble-based online OD method to function on streaming data. Carefully engineered requirements are compared to the most popular state-of-the-art online methods with an in-depth focus on variants based on the widely accepted isolation forest algorithm, thereby highlighting the lack of a flexible and efficient solution which is satisfied by PCB-iForest. Therefore, we integrate two variants into PCB-iForest—an isolation forest improvement called extended isolation forest and a classic isolation forest variant equipped with the functionality to score features according to their contributions to a sample’s anomalousness. Extensive experiments were performed on 23 different multi-disciplinary and security-related real-world datasets in order to comprehensively evaluate the performance of our implementation compared with off-the-shelf methods. The discussion of results, including AUC, F1 score and averaged execution time metric, shows that PCB-iForest clearly outperformed the state-of-the-art competitors in 61% of cases and even achieved more promising results in terms of the tradeoff between classification and computational costs.

Institut ProtectIT
30 S: TC Vilshofen S_EN: TC Vilshofen
Elektrotechnik und Medientechnik
DIGITAL