| Acronym | Meaning |
|---|
| CA | Crypto Authority |
| CAA | Crypto Approval Authority |
| CCTV | Closed Circuit Television |
| CDA | Crypto Distribution Authority |
| CIS | Communication and Information Systems handling EUCI |
| DSA | Designated Security Authority |
| EUCI | EU Classified Information |
| FSC | Facility Security Clearance |
| IA | Information Assurance |
| IAA | Information Assurance Authority |
| IDS | Intrusion Detection System |
| IT | Information Technology |
| LSO | Local Security Officer |
| NSA | National Security Authority |
| PSC | Personnel Security Clearance |
| PSCC | Personnel Security Clearance Certificate |
| PSI | Programme/Project Security Instructions |
| RCO | Registry Control Officer |
| SAA | Security Accreditation Authority |
| SAL | Security Aspects Letter |
| SCG | Security Classification Guide |
| SecOPs | Security Operating Procedures |
| TA | TEMPEST Authority |
| TFEU | Treaty on the Functioning of the EU |
