- California Sciences Institute
- Carnegie Mellon University [Pittsburgh]
- Center for Advanced Security Research Darmstadt [Darmstadt]
- Center for Advanced Studies [IBM CAS Canada]
- Center for Cybersecurity and Digital Forensics
- Center for Research and Exploration in Space Science and Technology [GSFC]
- Centre for Cybersecurity and Cybercrime Investigation [Dublin]
- Chinese Academy of Engineering
- Chinese Academy of Sciences [Beijing]
- Chitkara University
- Christiansen IT Law [Seattle]
- City University of Hong Kong [Hong Kong]
- Coalfire Systems
- Computer Science and Research Institute of Cyber Defense
- Computer Security Division
- Concordia University [Montreal]
- Coresec Systems [Malmo]
- Council for Scientific and Industrial Research
- Council for Scientific and Industrial Research [Pretoria]
- Customs and Excise Department [Hong Kong]