| Abbreviation | Definition |
|---|---|
| APG | Automated Password Generator |
| APKI | Architecture for Public Key Infrastructure |
| APKS | All Pairwise Key Scheme |
| APT | Anti-Piracy Technology |
| APWG | Anti-Phishing Working Group |
| ARC | Authenticated Request Code |
| ARIA | Acceptable Risk, Incorrect Acceptance |
| ARO | Annualized Rate of Occurrence |
| ARO | Annualized Rate of Occurrence (ARO) |
| ARS | Autonomously Replicating Sequence |
| ASA | Adaptive Security Algorithm |
| ASA | Adaptive Security Appliance |
| ASA | After Security Advisory |
| ASA | Automatic System Access |
| ASAC | Application Security Attack Component |
| ASAP | Application System Authorization Process |
| ASDA | Application Security Design Assessment |
| ASIC | Australian Securities Investments Commission |
| ASKMM | Advanced Standard Key Management Module |
| ASLC | Application Security Life Cycle |