- CEA Tech en régions
- CMP-GC
- CNIL
- CREATE-NET
- Catholic University of Leuven = Katholieke Universiteit Leuven
- Center for Advanced Security Research Darmstadt [Darmstadt]
- CentraleSupélec
- Centre National de la Recherche Scientifique
- Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional
- Chalmers University of Technology [Göteborg]
- Chinese Academy of Sciences [Beijing]
- Chinese Academy of Sciences [Changchun Branch]
- City University of Hong Kong [Hong Kong]
- Columbia University [New York]
- Commissariat à l'énergie atomique et aux énergies alternatives
- Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
- Commission nationale de l'informatique des libertés
- Computer Engineering Department
- Computer Science Department
- Computer Science and Communications Research Unit [Luxembourg]
- Computing Department
- Computing Laboratory
- Computing Science Laboratory - Oxford University
- Confidentialité, Intégrité, Disponibilité et Répartition
- Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain]
- Consiglio Nazionale delle Ricerche [Milano]
- Construction and Analysis of Systems for Confidentiality and Authenticity of Data and Entities
- Coventry University
- Create-Net
- Cryptography and Computeralgebra, Department of Computer Science
- Cybernetica [Tallinn]