Edgar Lopez-Rojas

Dr. Edgar Lopez-Rojas


Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 April 2019 in Complex Systems Informatics and Modeling Quarterly
Verified
Journal Article
Open access
PDF file
EZErjon Zoto
Erjon Zoto
MKMazaher Kianpour
Mazaher Kianpour
SKStewart Kowalski
Stewart Kowalski
ELEdgar Lopez-Rojas
Edgar Lopez-Rojas
Cybersecurity decisions are made across a range of social, technical, economic, regulatory and political domains. There is a gap between what companies and institutions plan to do while developing their internal IS-related policies and what should be done according to a multi-stakeholder system perspective in this area. Our task as researchers is to bridge this gap by offering potential solutions. The aim of our work is to promote the usage of the socio-technical systems (STS) approach to support the emerging role of systems thinking in cybersecurity education, using simulation as a supporting tool for learning. Meanwhile, new trends in cybersecurity curricula suggest an important shift toward new thinking approaches such as adversarial and systems thinking. We explored individuals’ adversarial and systems thinking skills in an open agent-based simulated environment and subsequently assessed the impact based on a participant survey. We discuss these results and point to directions for further investigation. The second contribution of the article is the provision of a tool for developing target users’ skills in making quantitative risk decisions and giving them a deeper understanding of the importance and use of key indices in the cyber risk management process.

1 January 2018 in International Journal of Simulation and Process Modelling
Verified
Journal Article
Closed access
ELEdgar Lopez-Rojas
Edgar Lopez-Rojas
SAStefan Axelsson
Stefan Axelsson
DBDejan Baca
Dejan Baca
Fraud controls for financial transactions are needed and required by law enforcement agencies to flag suspicious criminal activity. These controls however require deeper analysis of the effectiveness and the negative impact for the legal customers. Owing to the intrinsically private nature of financial transactions this analysis is often performed after several months of actively using fraud controls. In this paper, we present an analysis of different fraud prevention controls on a mobile money service based on thresholds using a simulator called PaySim. PaySim uses aggregated data from a sample dataset to generate a synthetic dataset that resembles the normal operation of transactions and injects malicious behaviour. With technology frameworks such as agent-based simulation techniques, and the application of mathematical statistics, we show in this paper that the simulated data can be as prudent as the original dataset for setting optimal controls for fraud detection.

1 December 2016
Verified
Conference Paper
Closed access
ELEdgar Lopez-Rojas
Edgar Lopez-Rojas
SAStefan Axelsson
Stefan Axelsson
The investigation of fraud in the financial domain has been restricted to those who have access to relevant data. However, customer financial records are protected by law and internal policies, therefore they are not available for most of the researchers in the area of fraud detection. This paper aims to present the work of those researchers who have had access to data and present an interesting approach to fraud detection research; which is the generation of a synthetic data set to work on fraud detection research. Some of the domains covered in this review include mobile money payments, e-payments, retail stores, online bank services and credit card payments. We also cover some of the most relevant surveys in the field and point out the impossibility to compare this work due to the lack of common public data set to test different results.

9 July 2019
Verified
Book Chapter
Closed access
PDF file
ELEdgar Lopez-Rojas
Edgar Lopez-Rojas
CBCamille Barneaud
Camille Barneaud

1 January 2015 in International Journal of Simulation and Process Modelling
Verified
Journal Article
Closed access
ELEdgar Lopez-Rojas
Edgar Lopez-Rojas
DGDan Gorton
Dan Gorton
SAStefan Axelsson
Stefan Axelsson
Managing fraud is important for business, retail and financial alike. One method to manage fraud is by detection, where transactions, etc. are monitored and suspicious behaviour is flagged for further investigation. There is currently a lack of public research in this area. The main reason is the sensitive nature of the data. Publishing real financial transaction data would seriously compromise the privacy of both customers, and companies alike. We propose to address this problem by building RetSim, a multi-agent-based simulation (MABS) calibrated with real transaction data from one of the largest shoe retailers in Scandinavia. RetSim allows us to generate synthetic transactional data that can be publicly shared and studied without leaking business sensitive information, and still preserve the important characteristics of the data. We then use RetSim to model two common retail fraud scenarios to ascertain exactly how effective the simplest form of statistical threshold detection could be. The preliminary results of our tested fraud detection method show that the threshold detection is effective enough at keeping fraud losses at a set level, that there is little economic room for improved techniques.

1 September 2018
Verified
Book Chapter
Closed access
PDF file
EZErjon Zoto
Erjon Zoto
SKStewart Kowalski
Stewart Kowalski
CFChristopher Frantz
Christopher Frantz
ELEdgar Lopez-Rojas
Edgar Lopez-Rojas
BKBasel Katt
Basel Katt