I'm Kristof Verslype,

researcher, advisor & speaker

in

crypto, privacy & blockchain tech

© Eleni Maniati
I obtained my doctoral degree (PhD) of engineering at the University of Leuven, Belgium. My research focused on improving the privacy of the citizen by using cryptography. I'm currently working at the research team of Smals, which provides IT services to Belgian governmental organizations. Every day, I continue my quest for improving privacy with cryptography, which has become even more relevant since the publication of the GDPR.

At Smals, I also got the unique opportunity to develop a deep understanding of blockchain technology, including bitcoin and smart contracts. My academic background in cryptography and privacy turned out to be a perfect match, since it helps me to approach this young and heavily hyped technology in a scientific and balanced way.

I use my year-long experience and knowledge to:
  • Devise new, innovative solutions
  • Analyse rigorously proposals and existing solutions on their security, privacy, scalability, efficiency, etc.
  • Disseminate knowledge and insight by writing articles and by giving seminars and courses.
  • Advise companies and organisations (consultancy).
In my private life, I do photography and I'm passionate about the Greek nature, language, culture & food.

My CV can be found here.

© Kelsey Ruys
University of Leuven
In 2004 I obtained a Master in Informatics at the University of Leuven (with distinction) with a thesis entitled: "Group and Ring Signatures", which are two related cryptographic primitives to create digital signatures in the name of a group.

In 2009, I was awarded, as PhD student, the Best Paper Award from SECRYPT, the international conference on security and cryptography for my paper: Service and Timeframe Dependent Unlinkable One-Time Pseudonyms.

In 2011, I obtained at the University of Leuven my PhD of Engineering with a dissertation entitled: “Improving privacy in applications by managing the disclosure of personal properties”. The aim was to develop and facilitate the development of applications whereby the certified personal user data that are being disclosed to the service provider are minimized, while the latter still has sufficient information and guaranties to offer its services. Today, this is called self-sovereign identity. One of the key cryptographic tools in my reserach were attribute-based credentials, as well as the underlying zero-knowledge proofs.

The list of my academic publications can be found here.

During my time at the university, I have been teaching various courses for various student groups and I have been coaching theses of several master students, of which two obtained later a PhD as well. Occasionaly, there is still collabaration between the University of Leuven and me at Smals. I coached, for instance, during the academic year 2016-2017 a master student on his thesis "Kruisen van persoonsgegevens met maximale bescherming van de privacy (Linking together Personal Identifiable Data with Maximal Protection of the Privacy)".

In 2015 I passed the online Coursera course Cryptography I offered by Stanford University. I got 100 % (with distinction).
Smals (Belgian Government)
In 2011, I joined the research team of Smals, which provides IT services to Belgian governmental institutions. As researcher, I study new concepts and try to solve with them technical challenges within government context. Furthermore, Smals Research is doing knowledge transfer inside the government under the form of presentations and advise.

My main occupations so far are
  • Data protection and cloud strategies for governments
  • Anonymisation and pseudonymisation of PII (Personal Identifiable Information)
  • Bitcoin, blockchain and smart contracts
  • Advanced cryptographic techniques
I introduced the first technical knowledge about blockchain and smart contracts into the Belgian federal government.

The government processes many personal data, which poses privacy challenges. This issue comes back in all the research i'm doing. I try to come up with new and innovative cryptographic concepts to protect the privacy of the citizen. I give you below an idea of three of these proposed innovations.

Medical Prescriptions on a Public Blockchain

Processing a medical prescription involves a complex information flow which can be eliminated by putting the prescriptions on a publicly accessible blockchain. However, strong guarantees are required to protect the privacy of the patient and the business information of other involved entities such as the physician, the pharmacist and the insurer. Still, the involved entities should be able to retrieve the information needed to process the prescription. To reconcile these seemingly irreconcilable requirements, we came up with a novel cryptographic approach to make prescriptions only linkble by those entities who need to be able to do so.



Combining Personal Identifiable Information from Multiple Sources

What if a research team wants to analyse large sets of personal data? Say it needs medical, financial and demographic data of all citizens with a wage of at least €40.000, born after 1990 and who are self-employed as a secondary activity. Data sets managed by different government institutions would need to be linked together. Such requests are common, and any government should be able to answer them. Yet is it possible with due respect for the privacy of citizens in an era of big data? By making records in different data sets unlinkable, we were able to push the boundaries of what is technically feasible. This brings the security to a higher level and gives the control of the data back to the government organizations that own it.


Exchanging PII with Mutualities while hiding mutuality membership

The Crosroad Bank of the Social Security (CBSS) needs to be able to send to and receive from the mutualities (insurers) PII of citizens. For the mutualities, it is unacceptable that the CBSS learns the mutuality to which a citizen is affiliated. Now, an intermediary party, managed by the seven mutualities is used. We came up with a solution that can do the same, but without the need to trust an intermediate party.
Other
I am member of the jury of experts of INNOVIRIS, the Brussels institute for research and innovation.
I am regularly asked as a speaker. Besides my public talks, which are listed below, I also frequently give non-public talks and courses. Usually, my topics are about:




Upcoming Talks

Blockchain & Smart Contracts – Inleiding voor juristen

Course for Larcier Group
3Square Ghent
Dutch

Blockchain –
a New Tool for
the Auditor?

Seminar by ISACA
University of Leuven, Campus
Brussels, English

The Disruptive Power
of
Blockchain Technology

Guest Lecture, University of Leuven
Faculty of Economics, Leuven
English

Blockchain & Toepassingen - Een grondige kijk onder de motorkap

Workshop SAI
Van der Valk Hotel, Diegem
Dutch

7 Facts
Bitcoin Believers Will
Never Tell You

Talk at Infosecurity 2018
Brussels Expo
English

Past Talks

Blockchain & smart contracts – Technologie en toepassingen

Evening Conference by SAI
Crowne Plaza Hotel, Antwerp
Dutch

Bitcoin, blockchain & smart contracts – Impact op de juridische sector

Seminar by Lexalert
Online
Dutch

Blockchain & Smart Contracts. Introduction & Practical Use Case

Seminar for Brussels Legal Hackers
The Sister Brussels Cafe, Brussels
English

Medical Prescriptions
on a
Public Blockchain

Talk at Techorama 2017
Kinepolis, Antwerp
English

Linking together personal data in the era of Big Data and GDPR

Talk at Infosecurity 2017
Brussels Expo
English

Infosession:
Blockchain & Smart Contracts

Talk in auditorium of Smals
Brussels
Dutch

Infosession:
Privacy Vs. Analytics
 

Talk in auditorium of Smals
Brussels
Dutch

Thanks again for your great tandem last week. I hear a lot of positive feedback.Tommy
Thank you very much for your excellent presentation, in front of a captivated audience.Jacques
It was amazing!Laurent
I'm writing regularly articles about my professional interests.
Unfortunately Dutch-only for the moment.
More articles are scheduled. Stay tuned!

‘De bitcoin is een ecologische ramp’

19/10/2017
Voor de ontginning van de virtuele munt bitcoin is in één jaar tijd ongeveer evenveel elektriciteit nodig als wat half Vlaanderen in dezelfde tijdsspanne verbruikt. ‘Een zware ecologische prijs om betalingen uit te kunnen voeren zonder de tussenkomst van een bank.’ … Continue reading →

Bitcoin – Van Experiment tot Ecologische Ramp

17/10/2017
Op 22 mei 2010 kocht een software ontwikkelaar 2 pizza’s voor 10 000 bitcoins. Vandaag zijn 10 000 bitcoins ongeveer 40 miljoen dollar waard. Die astronomische stijging spreekt tot de verbeelding. Toch heeft dit succesverhaal een nauwelijks belichte keerzijde … Continue reading →

Blockchain - Wervelwind in de audit wereld?

19/09/2017
Blockchain is een baanbrekende technologie. Het is de ruggengraat van Bitcoin, de digitale cryptomunt waarmee u geld kunt transfereren zonder dat daar een bank aan te pas komt. Die blockchain-technologie kan ook ingezet worden in andere domeinen om het belang … Continue reading →

Open en minder open blockchain netwerken

07/06/2017
Blockchain zag in 2009 het licht met de lancering van Bitcoin. Het Bitcoin netwerk is extreem open en transparant; iedereen kan minen1, iedereen kan transacties publiceren en iedereen kan de volledige inhoud van de blockchain zien. Daarenboven kan iedereen wereldwijd … Continue reading →

Beslissingsmodel: Wanneer blockchain gebruiken?

11/01/2017
Blockchain wordt gezien als een disruptieve technologie die de komende jaren een grote impact zal hebben, ook in overheidscontext. Veel bedrijven en overheden zullen dan ook geconfronteerd worden met de vraag of blockchain technologie een meerwaarde kan hebben bij de … Continue reading →

Smart Contracts – Autonome code op een blockchain

18/10/2016
In een eerdere blogpost hadden we het over Bitcoin en blockchains. Indien deze termen u vertrouwd in de oren klinken is de kans groot dat u ook al de term smart contract heeft horen waaien, wat ook wel blockchain 2.0 genoemd wordt. Deze blogpost gaat hier dieper op in. … Continue reading →

Keyless Signature Infrastructure (KSI) – Een alternatief op PKI voor digitale handtekeningen?

22/03/2016
Een public key infrastructure, of kortweg PKI, wordt algemeen gezien als de enige manier om digitale handtekeningen te plaatsen. Toch heeft Estland al acht jaar een alternatief dat luistert naar de naam Keyless Signature Infrastructure, of kortweg KSI. Hoe werkt … Continue reading →

Blockchain, het kloppend hart van Bitcoin

23/02/2016
Bitcoin is de eerste gedistribueerde cryptocurrency, of anders gezegd, de eerste munteenheid die voor financiële transacties dankzij cryptografie geen nood heeft aan centrale partijen, zoals traditioneel de banken. Het kloppend hart van het in 2009 gelanceerde Bitcoin is de blockchain, … Continue reading →

De Cloud is als... Elektriciteit? Of toch eerder Goud?

30/09/2015
Het gebruik van cloud diensten wordt vaak vergeleken met het gebruik van electriciteit. Toch mogen we deze vergelijking niet te ver doortrekken. Wanneer we spreken over gevoelige overheidsgegevens lijkt een andere vergelijking accurater. Vergelijking 1: Cloud & Electriciteit Gebruik van … Continue reading →

Big data & krakend ijs onder anonimisatie

12/05/2015
Inleiding Elk bedrijf bezit wel persoonsgegevens. Denken we maar aan winkels, banken en transportbedrijven. Deze gegevens kunnen interessant zijn voor andere doeleinden dan waarvoor ze initieel verzameld werden. Dit kan binnen het eigen bedrijf zijn, maar gegevens kunnen ook voor … Continue reading →