| Abbreviation | Definition |
|---|---|
| DDOSA | DDoS attack |
| DDPE | Dell Data Protection Encryption |
| DDS | Distributed Denial of Service |
| DeCSS | Decrypt Content Scrambling System |
| DEDSS | Data Encryption Digital Signature System |
| DEK | Data Encryption Key |
| DEK | Device Encryption Key |
| DES | Defense Encryption Standard |
| DES | Des Data Encryption Standard |
| DES | Division of Employment Security |
| DESCBC | Data Encryption Standard Cipher Block Chaining |
| DHSEM | Department of Homeland Security and Emergency Management |
| DHSEM | Division of Homeland Security and Emergency Management |
| DICE | DNA-Integrated Cybernetic Enterprises |
| DIRS | Disaster Information Reporting System |
| DISSC | Dual-Interface Security Smart Card |
| DITSCAP | Defense Information Technology Security Certification and Accreditation Program |
| DLE | Downgraded Legacy Encryption |
| DLED | dicated Loop Encryption Device |
| DLED | Digital Loop Encryption Device |