- Center for Advanced Security Research Darmstadt [Darmstadt]
- Centre National de la Recherche Scientifique
- Centre for Applied Research in Information Systems
- Centre for Cybercrime and Computer Security [Newcastle]
- Centre for Quantum Computation and Intelligent Systems [Sydney]
- Chercheur indépendant
- Chiba Institute of Technology
- Chinese Academy of Sciences [Changchun Branch]
- Chosun University
- College of Mathematics, Physics and Information Engineering [Jinhua]
- Computer Engineering Department
- Computer Graphics and HCI Group [Kaiserslautern]
- Computer Science and Communications Research Unit [Luxembourg]
- Concordia Institute for Information Systems Engineering
- Concordia University [Montreal]
- Consiglio Nazionale delle Ricerche [Milano]
- Coventry University
- Cryptography and Computeralgebra, Department of Computer Science