"Since asymmetries of information give rise to market power, and perfect competition is required if markets are to be efficient, it is perhaps not surprising that markets with information asymmetries and other information imperfections are far from efficient."
             JOSEPH STIGLITZ

The production of data, of either human or automatic origin, has grown tremendously in the past decades, in parallel with the capacity to transform them through analytics or learning. It resulted in the emergence of a digital sphere, to which people and things are connected, which ensures new forms of mediation to knowledge, services or goods.
The digital sphere offers new opportunities while profoundly disrupting the social, economic and political organisation. My research is devoted to the following topics:

reticulation, horizontalization, and complexification of society

data flows and new economic and political imbalances

territories, geopolitics and cyber conflicts

public administration and digital platforms

anthropocene, resources and digital mediation

Anthropocène, à l'école de l’indiscipline.
Stéphane Grumbach, Olivier Hamant, Julie Le Gall, Ioan Negrutiu (Eds).
Editions du temps circulaire, Janv. 2019

A Cartography of Web Tracking using DNS Records,
with Jingxiu Su, Zhenyu Li, Muhammad Ikram, Kave Salamatian, & Gaogang Xie,
Computer Communications Volume 134, 15 January 2019, Pages 83-95

Géopolitique des technologies,
avec Clément Renaud,
in Révolutions technologiques : d'un monde à l'autre, Questions internationales N°91-92, La Documentation française, Juin 2018

Toward Accurate Inference of Web Activities from Passive DNS Data,
with J Su, Z Li, K Salamatian, C Han, G Xie,
IEEE/ACM International Symposium on Quality of Service, 4-6 June 2018 – Banff, Alberta, Canada pdf,

Dans les griffes des algorithmes,
Revue Infra-mince, n° 11, Filigranes Editions / ENSP, juin 2018

The "Datasphere", Data Flows beyond Control, and the Challenges for Law and Governance,
with Jean-Sylvestre Bergé and Vincenzo Zeno-Zencovich,
European Journal of Comparative Law and Governance, Vol 5:2, Brill, May 2018 online,

Digital Revolution or Anthropocenic Feedback?,
with Olivier Hamant,
The Anthropocene Review, December 2017 pdf,

Digital Platforms: A New Grammar for Territories?
Ethics in Progress, Vol 8.1 (2017): 108-124.

Secure and trustable distributed aggregation based on kademlia.
with Robert Riemann.
IFIP International Conference on ICT Systems Security and Privacy Protection. Springer, Cham, 2017

La sphère des données et le droit : nouvel espace, nouveaux rapports aux territoires,
avec Jean-Sylvestre Bergé,
Journal du droit international, Clunet, n° 4, Octobre 2016, var. 6

Platforms as Governments,
with Aurélien Faravelon,
IPP Internet, Politics, and Policy conference, Oxford, september 2016, paper

The Complexity of Public and Private Policies for Big Data,
with Scott Cunningham and Aurélien Faravelon,
22nd ICE/IEEE ITMC International Technology Management Conference, Trondheim, June 2016

Chasing data in the Intermediation Era: Economy and Security at stakes
with A Faravelon, and S Frénot,
in IEEE Security and Privacy Magazine, vol.14, 2016

Qu'est-ce que l'intermédiation algorithmique?
1024 Bulletin de la société informatique de France, novembre 2015 pdf

Intermediation Platforms, an Economic Revolution,
short paper in ERCIM News 99, October 2014

Des données à l’intermédiation, une évolution économique et politique,
avec Stéphane Frénot,
in Données massives : nouvelles partitions de l’information, De Boeck, 2014 pdf

La Chine au coeur de la société de l'information,
in Une autre émergence~? Puissance technique et ressorts culturels en Inde et en Chine, édité par Marianne Bastid-Bruguière, Débat Public, Hermann, août 2014 pdf

Les données sociales, objets de toutes les convoitises,
avec Stéphane Frénot,
in Hérodote, revue de géographie et de géopolitique, No 152-153 — Cyberespace : enjeux géopolitiques, 2014.

Data Harvesting 2.0: from the Visible to the Invisible Web,
with Claude Castellucia, and Lukasz Olejnik,
The Twelfth Workshop on the Economics of Information Security, WEIS 2013, Georgetown University, Washington, D.C., June 11-12, 2013 pdf

Le «vrai Grand Bond en avant». La politique de recherche et d'innovation en Chine
avec Guilhem Fabre
Revue Le Débat, n° 173, Janvier - février 2013, Gallimard

MACHINE DE VOTE ELECTRONIQUE ET INFRASTRUCTURE COMPORTANT UNE TELLE MACHINE
Inventeurs: REIMERT Damien; FRENOT Stéphane; GRUMBACH Stéphane; MEYFFRET Simon.
BOPI. Brevet INPI n° 3.037.702. 23 décembre 2016.