Zeno Geradts writes his experiences as forensic scientist
Sunday, April 10, 2016
Likelihood ratios, Digital Evidence and Big Data cloud systems, the paradox of security and forensic science
During the conference of Digital Forensic Research Workshop EU in Lausanne several topics were important. A wide range of new developments was published in the proceedings. During the keynote talks also attention was given to the issues with decryption of smart phones and several solutions were brought to attention, as well as the paradox that exists between security and digital evidence. Other solutions and issues were brought forward on collecting data from the cloud as digital evidence, as well as issues with time stamps that might occur.
A nice panel discussion on the different aspects of using Bayes and likelihood ratios provided different views on using it in digital evidence. Though one would not easily use this for dictionary attacks of passwords, it is used in interpretation of the evidence. The hypothesis of the defence and of the prosecutor should be clear however. And questions rise if the defence is able to provide a good hypothesis, since education and insights on different scenarios is needed.
Also one topic of importance is that users of the reports should also understand the report and the conclusions drawn and interpret them correctly. In law systems with trained judged and prosecutors this might be easier then with a jury that is generally not trained in Bayes Theorem and the use of likelihood ratios. Some good guidelines of using this are provided by ENFSI.
Prof. dr. Zeno Geradts is a senior forensic scientist at the Netherlands Forensic Institute of the Ministry of Justice at the Digital Evidence and Biometrics section in the area of forensic (video) image processing and biometrics and works also on Forensic big data analysis. From September 1st 2014, he is appointed as professor on forensic data science by special appointment at the University of Amsterdam.
Zeno Geradts works since 1991 at the Netherlands Forensic Institute as a forensic scientist. Since 1997 he works at the digital evidence departement. He is expert witness in image analysis and biometrics as well as R&D coordinator in digital evidence and program manager Big Data and Intelligent Data Analysis. In 2002 he received a PhD from the University of Utrecht based on research on computational matching of forensic images. At the AAFS he has been chairman of the Engineering Section and since 2008-2010 chairman of the section Digital Evidence and Multimedia, he was elected by the section as member of the Board of Directors of the AAFS from 2010-2013. He is elected as Vice Oresident of the AAFS 2015-2016. He is chairman of the ENFSI Forensic IT working group. He published many papers in forensic journals and contributions to books and is active on casework as expert witness and projects in digital evidence. Since 2014 he is also appointed for 1 day a week as special chair forensic data sciences at the University of Amsterdam
Specialties: Forensic Science, program manager big data and cyber forensics, forensic ict, digital evidence and multimedia, face comparison, biometrics, video analysis, R&D coordination.