Document Type


Publication Date


Subject: LCSH

Cyber forensics, Computer forensics, Local area networks (Computer networks)--Traffic, Hashing (Computer science)


Computer Engineering | Computer Sciences | Electrical and Computer Engineering | Forensic Science and Technology | Information Security


In recent years, Internet technologies changed enormously and allow faster Internet connections, higher data rates and mobile usage. Hence, it is possible to send huge amounts of data / files easily which is often used by insiders or attackers to steal intellectual property. As a consequence, data leakage prevention systems (DLPS) have been developed which analyze network traffic and alert in case of a data leak. Although the overall concepts of the detection techniques are known, the systems are mostly closed and commercial. Within this paper we present a new technique for network traffic analysis based on approximate matching (a.k.a fuzzy hashing) which is very common in digital forensics to correlate similar files. This paper demonstrates how to optimize and apply them on single network packets. Our contri- bution is a straightforward concept which does not need a comprehensive configuration: hash the file and store the digest in the database. Within our experiments we obtained false positive rates between 10-4 and 10-5 and an algorithm throughput of over 650 Mbit/s.


Copyright (c) 2014 Journal of Digital Forensics, Security and Law This work is licensed under a Creative Commons Attribution 4.0 International License.

Dr. Baggili was appointed to the University of New Haven's Elder Family Endowed Chair in 2015.

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

Publisher Citation

Breitinger, F. & Baggili, I. (2014). File detection on network traffic using approximate matching. Journal of Digital Forensics, Security and Law. Special Issue: 2014 ICDF2C / SADFE. 9(2): 23-36.

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