- CIDER
- Catholic University of Leuven = Katholieke Universiteit Leuven
- Center for Digital Safety & Security [Vienna]
- Center for Usability Research and Engineering [Vienna]
- CentraleSupélec
- Centre National de la Recherche Scientifique
- Centre de Gestion Scientifique i3
- Centre d’Excellence en Technologies de l’Information et de la Communication
- Centre for Health, Law and Emerging Technologies
- Centre for the Study of the Sciences and the Humanities
- Chair of Mobile Business & Multilateral Security
- Chaire Valeurs Politiques des Informations Personnelles
- Chercheur indépendant
- Cloud and Security Lab [Bristol]
- Colorado State University [Fort Collins]
- Commonwealth Scientific and Industrial Research Organisation [Australia]
- Computer Security and Industrial Cryptography [KU Leuven]
- Computer Technology Institute and Press "Diophantus"
- Computer Technology Institute and Press "Diophantus" [Greece]
- Confidentialité, Intégrité, Disponibilité et Répartition
- Cranfield University