- CAaNES, LLC [RiskSense, Inc]
- CIDER
- CITI Centre of Innovation in Telecommunications and Integration of services
- California Institute of Technology
- California State University [Fullerton]
- California State University [Northridge]
- Cardiff University
- Catholic University of Leuven = Katholieke Universiteit Leuven
- Center for Advanced Studies [IBM CAS Canada]
- Center for Information Management, Integration and Connectivity (Rutgers University)
- Center for Secure Information Systems [Fairfax]
- CentraleSupélec
- Centre National de la Recherche Scientifique
- Changhong
- Chinese Academy of Sciences [Beijing]
- Chinese Academy of Sciences [Changchun Branch]
- Clausthal University of Technology
- College of Information Sciences and Technology
- Colorado State University [Fort Collins]
- Computer Engineering Department, Faculty of Engineering
- Computer Science Department [SUNY]
- Computer Security Division
- Computing Division
- Concordia Institute for Information Systems Engineering
- Concordia University [Montreal]
- Confidentialité, Intégrité, Disponibilité et Répartition
- Cork Constraint Computation Centre