Edouard Klein's personal page


Essays and articles


Public speaking

Research and teaching


Things written about me

Cyber law enforcement and court cases

three young engineers were charged with deception for writing a bogus smart contract on the ethereum side chain Arbitrum. I was tasked with analyzing the smart contract and explaining my findings to the court.
The biggest criminal encrypted phone network at the time. I was tasked, before the encryption was broken, with clustering users based on metadata alone.
Privat vs. Kolomoisky
A court case in the U.K. where I was tasked with assessing the expected revenue from a Bitcoin mining operation
For the first time in France, a law enforcement agency was authorized to mass-remove a piece of malware from infected computers without the explicit authorization of the victim, no matter where the infected computers happened to be. I was tasked with monitoring the botnet while we killed it, logging0 and counting the remediation actions, and looking for reinfections or clean-up failures.
This is, to the best of my knowledge, the first time anybody has been convicted in relation to a ransomware operation. I was tasked with taking over the bitcoin forensics part of the investigation, started by a good friend of mine, who then took it over from me two years later once he got to Europol.

Software I've written

The french ministry of Justice paid north of a hundred millions euros for a piece of shit for dysfunctional software. A colleague and I wrote a tool to filter the bogus output out of the investigation data, thus preventing hundreds false leads.
A semi automated labelling system for pedopornographic images
Make it look like a PDF was printed, signed, and then digitized again. Useful to placate stupid bureaucrats.
Transparent yet confidential accounting
I wrote the first smart contract to be officially used by a government institution. See my article about it (in french).