Artificial Intelligence-Based Anomaly Detection Technology over Encrypted Traffic: A Systematic Literature Review
Open accessAbstract
As cyber-attacks increase in unencrypted communication environments such as the traditional Internet, protected communication channels based on cryptographic protocols, such as transport layer security (TLS), have been introduced to the Internet. Accordingly, attackers have been carrying out cyber-attacks by hiding themselves in protected communication channels. However, the nature of channels protected by cryptographic protocols makes it difficult to distinguish between normal and malicious network traffic behaviors. This means that traditional anomaly detection models with features from packets extracted a deep packet inspection (DPI) have been neutralized. Recently, studies on anomaly detection using artificial intelligence (AI) and statistical characteristics of traffic have been proposed as an alternative. In this review, we provide a systematic review for AI-based anomaly detection techniques over encrypted traffic. We set several research questions on the review topic and collected research according to eligibility criteria. Through the screening process and quality assessment, 30 research articles were selected with high suitability to be included in the review from the collected literature. We reviewed the selected research in terms of dataset, feature extraction, feature selection, preprocessing, anomaly detection algorithm, and performance indicators. As a result of the literature review, it was confirmed that various techniques used for AI-based anomaly detection over encrypted traffic were used. Some techniques are similar to those used for AI-based anomaly detection over unencrypted traffic, but some technologies are different from those used for unencrypted traffic.
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Existing surveys primarily organize the literature along algorithmic, pipeline-oriented, or domain-specific dimensions and do not explicitly structure the ICS/CPS anomaly detection landscape according to the type of data used for detection.
“However, they primarily organize the literature along algorithmic, pipeline-oriented, or domain-specific dimensions and do not explicitly structure the ICS/CPS anomaly detection landscape according to the type of data used for detection.”
From AI-Based Anomaly Detection in Industrial Control and Cyber–Physical Systems: A Data-Type-Oriented Systematic Review (2025) · cites this paper as [5]
The Introduction (page not provided) describes this review as focused on encrypted traffic and organized around datasets, processing steps, algorithms, and performance indicators. The Discussion, §4.1 (page not provided), mentions ICS as an area lacking suitable datasets, but the paper does not assess how existing ICS/CPS surveys organize their literature. It therefore supports an example of a domain- and pipeline-oriented review, not the broader claim about existing surveys. (LLM, conf=0.82)
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- Authors
- Ji, I. H., Lee, J. H., Kang, M. J., Park, W. J., Jeon, S. H., & Seo, J. T.
- Affiliations
- Gachon University (KR)
- Department of Computer Engineering (Smart Security), Gachon University, Seongnam-si 1342, Republic of Korea
- Corresponding author
- Seo, Jung Taek
- Venue
- Sensors
- Publisher
- MDPI AG
- Published
- 2024-01-30
- Volume
- 24
- Issue
- 3
- Pages
- 898
- ISSN
- 1424-8220 (ISSN-L)
- PMC
- PMC10857182
- OpenAlex
- W4391345033
- Cited by
- 74
- References
- 66
- Citations by year
- 2026: 29 · 2025: 34 · 2024: 11
- FWCI
- 4.30
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Sensors (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Institute of Information & communications Technology Planning & Evaluation (IITP) (RS-2023-00241376)
- Topics
- Physical Sciences › Computer Science › Computer Networks and Communications › Network Security and Intrusion Detection
- Physical Sciences › Computer Science › Artificial Intelligence › Internet Traffic Analysis and Secure E-voting
- Physical Sciences › Computer Science › Artificial Intelligence › Adversarial Robustness in Machine Learning
- Keywords
- encrypted traffic, network anomaly detection, artificial intelligence, Transport Layer Security, feature extraction, feature selection, network security, malicious traffic detection
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