| DAC | Discretionary Access Control |
| DBA | Database Administrator |
| DDoS | Distributed Denial of Service |
| DEP | Data Execution Prevention |
| DES | Digital Encryption Standard |
| DHCP | Dynamic Host Configuration Protocol |
| DHE | Diffie-Hellman Ephemera |
| DKIM | DomainKeys Identified Mail |
| DLP | Data Loss Prevention |
| DMARC | Domain Message Authentication Reporting and Conformance |
| DNAT | Destination Network Address Translation |
| DNS | Domain Name System |
| DoS | Denial of Service |
| DPO | Data Privacy Officer |
| DRP | Disaster Recovery Plan |
| DSA | Digital Signature Algorithm |
| DSL | Digital Subscriber Line |
| EAP | Extensible Authentication Protocol |
| ECB | Electronic Code Book |
| ECC | Elliptic Curve Cryptography |
| ECDHE | Elliptic Curve Diffie-Hellman Ephemeral |
| ECDSA | Elliptic Curve Digital Signature Algorithm |
| EDR | Endpoint Detection and Response |
| EFS | Encrypted File System |
| ERP | Enterprise Resource Planning |
| ESN | Electronic Serial Number |
| ESP | Encapsulated Security Payload |