| Abbreviation | Definition |
|---|---|
| ACMP | Access Control Management Program |
| ACRU | Active Confirmed Registered User |
| ACS | Access Control System |
| ACS | Accredited Certification Scheme |
| ACS | Authenticated Content Signing |
| ACT | Access Coordination Team |
| ACU | Access Control Unit |
| ADFT | Advanced Digital Forensic Technique |
| ADG | Advanced Data Guardian |
| ADHOC | Associated Destructive Hackers Of Columbia |
| ADK | Additional Decryption Key |
| ADMS | Advanced Distributed Monitoring System |
| ADPSO | Automatic Data Processing Security Officer |
| ADPSP | Automatic Data Processing Security Plan |
| ADSS | Access Decision Support Services |
| ADT | Advanced Development Tool |
| ADT | Ant Detection Technology |
| AERN | Advanced EAS (Emergency Alert System) Relay Network |
| AESD | Advanced Encryption Standard Development |
| AESDE | Advanced Encryption Standard Development Effort |