- CIDER
- CITI Centre of Innovation in Telecommunications and Integration of services
- CNR Istituto di Scienza e Tecnologie dell’Informazione “A. Faedo” [Pisa]
- California State University [Northridge]
- Carleton University
- Catholic University of Leuven = Katholieke Universiteit Leuven
- Center for Advanced Security Research Darmstadt [Darmstadt]
- CentraleSupélec
- Centre National de la Recherche Scientifique
- Centre Tecnològic de Telecomunicacions de Catalunya = Telecommunications Technological Centre of Catalonia
- Centrum Wiskunde & Informatica
- Certus Centre for Software Validation and Verification
- Chair in Information Systems III
- Chalmers University of Technology [Göteborg]
- Chongqing Jiaotong University
- Chung-Ang University [Seoul]
- City University London
- City University of Hong Kong [Hong Kong]
- Communication and Computing Research Centre
- Communications Research Centre Canada
- Computational and Information Sciences Directorate
- Confidentialité, Intégrité, Disponibilité et Répartition