| Abbreviation | Definition |
|---|---|
| ISS | Internet Security Systems |
| ISSA | Information System Security Association |
| ISSO | Information Systems Security & Operations |
| ISSRA | Israel Sovereignty Security Recognition Act |
| ISSRT | Institute for Safety Security Rescue Technology |
| IVES | Information Vending Encryption System |
| JBCP | Jhenaidah Broadband Cyber Point |
| JCAC | Joint Cyber Analysis Course |
| JCSM | Journal of Cyber Security and Mobility |
| JCSS | Journal of Cyberspace Studies |
| JESD | Joint Emergency Services Drill |
| JNCIS | Juniper Networks Certified Specialist Security |
| JOSE | JSON Object Signing and Encryption |
| JSCU | Joint Sigint Cyber Unit |
| JTCI | Journal of Terrorism Cyber Insurance |
| JWE | JSON Web Encryption |
| KAE | Key Agile Encryption |
| KCP | Korea Cyber Payment |
| KCSA | KADDB Cyber Security Academy |
| KCW | Kerala Cyber Warriors |