- Access Control
- Access Control Server (ACS)
- Account Takeover (ATO)
- Account Verification
- Advanced Persistent Threat (APT)
- Affiliate Fraud
- Anti-Phishing
- Application Fraud (New Account Fraud)
- Application Layer Firewall
- Application Programming Interface (API)
- Application Security
- Artificial Intelligence (AI)
- Artificial Neural Network
- ATM Skimming
- Attack Surface
- Authentication
- Authentication Factor
- Authorization
- Authorized Push Payment Fraud (Scams)
- AVS