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On the Network Performance of Digital Evidence Acquisition of Small Scale Devices over Public Networks
Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
2015 (English)In: The Journal of Digital Forensics, Security and Law, ISSN 1558-7215, E-ISSN 1558-7223, Vol. 10, no 3, 59-86 p.Article in journal (Refereed) Published
Abstract [en]

While cybercrime proliferates – becoming more complex and surreptitious on the Internet – the tools and techniques used in performing digital investigations are still largely lagging behind, effectively slowing down law enforcement agencies at large. Real-time remote acquisition of digital evidence over the Internet is still an elusive ideal in the combat against cybercrime. In this paper we briefly describe the architecture of a comprehensive proactive digital investigation system that is termed as the Live Evidence Information Aggregator (LEIA). This system aims at collecting digital evidence from potentially any device in real time over the Internet. Particular focus is made on the importance of the efficiency of the network communication in the evidence acquisition phase, in order to retrieve potentially evidentiary information remotely and with immediacy. Through a proof of concept implementation, we demonstrate the live, remote evidence capturing capabilities of such a system on small scale devices, highlighting the necessity for better throughput and availability envisioned through the use of Peer-to-Peer overlays.

Place, publisher, year, edition, pages
2015. Vol. 10, no 3, 59-86 p.
Keyword [en]
Digital Forensics, Digital Evidence, Remote acquisition, Proactive forensics, Mobile devices, P2P, Network performance Availability
National Category
Information Systems
Research subject
Computer and Systems Sciences
URN: urn:nbn:se:su:diva-122847ISI: 000363877200004OAI: diva2:868517
Available from: 2015-11-11 Created: 2015-11-10 Last updated: 2016-06-17Bibliographically approved
In thesis
1. Towards Automation in Digital Investigations: Seeking Efficiency in Digital Forensics in Mobile and Cloud Environments
Open this publication in new window or tab >>Towards Automation in Digital Investigations: Seeking Efficiency in Digital Forensics in Mobile and Cloud Environments
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Cybercrime and related malicious activity in our increasingly digital world has become more prevalent and sophisticated, evading traditional security mechanisms. Digital forensics has been proposed to help investigate, understand and eventually mitigate such attacks. The practice of digital forensics, however, is still fraught with various challenges. Some of the most prominent of these challenges include the increasing amounts of data and the diversity of digital evidence sources appearing in digital investigations.

Mobile devices and cloud infrastructures are an interesting specimen, as they inherently exhibit these challenging circumstances and are becoming more prevalent in digital investigations today. Additionally they embody further characteristics such as large volumes of data from multiple sources, dynamic sharing of resources, limited individual device capabilities and the presence of sensitive data. These combined set of circumstances make digital investigations in mobile and cloud environments particularly challenging.

This is not aided by the fact that digital forensics today still involves manual, time consuming tasks within the processes of identifying evidence, performing evidence acquisition and correlating multiple diverse sources of evidence in the analysis phase. Furthermore, industry standard tools developed are largely evidence-oriented, have limited support for evidence integration and only automate certain precursory tasks, such as indexing and text searching.

In this study, efficiency, in the form of reducing the time and human labour effort expended, is sought after in digital investigations in highly networked environments through the automation of certain activities in the digital forensic process. To this end requirements are outlined and an architecture designed for an automated system that performs digital forensics in highly networked mobile and cloud environments. Part of the remote evidence acquisition activity of this architecture is built and tested on several mobile devices in terms of speed and reliability. A method for integrating multiple diverse evidence sources in an automated manner, supporting correlation and automated reasoning is developed and tested. Finally the proposed architecture is reviewed and enhancements proposed in order to further automate the architecture by introducing decentralization particularly within the storage and processing functionality. This decentralization also improves machine to machine communication supporting several digital investigation processes enabled by the architecture through harnessing the properties of various peer-to-peer overlays.

Remote evidence acquisition helps to improve the efficiency (time and effort involved) in digital investigations by removing the need for proximity to the evidence. Experiments show that a single TCP connection client-server paradigm does not offer the required scalability and reliability for remote evidence acquisition and that a multi-TCP connection paradigm is required. The automated integration, correlation and reasoning on multiple diverse evidence sources demonstrated in the experiments improves speed and reduces the human effort needed in the analysis phase by removing the need for time-consuming manual correlation. Finally, informed by published scientific literature, the proposed enhancements for further decentralizing the Live Evidence Information Aggregator (LEIA) architecture offer a platform for increased machine-to-machine communication thereby enabling automation and reducing the need for manual human intervention.

Place, publisher, year, edition, pages
Stockholm: Department of Computer and Systems Sciences, Stockholm University, 2016. 139 p.
Report Series / Department of Computer & Systems Sciences, ISSN 1101-8526 ; 16-004
Computer forensics, network forensics, mobile devices, mobile forensics, cloud computing, semantic web, hypervisors, virtualization, remote acquisition, automation, evidence analysis, correlation, P2P, bittorrent
National Category
Computer Science
Research subject
Computer Science; Information Systems Security
urn:nbn:se:su:diva-130742 (URN)
2016-04-25, L30, Nod Building, Borgarfjordsgatan 12 (Nodhuset), Campus Kista, Stockholm, 10:00 (English)
Available from: 2016-06-17 Created: 2016-06-02 Last updated: 2016-06-20Bibliographically approved

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