| Abbreviation | Definition |
|---|---|
| ELS | Equidistant Letter Sequence |
| Emacs | Editor MACroS |
| EMS | Electronic Media Sanitization |
| ENISA | European Network and Information Security Agency |
| EPE | Enhanced Privacy and Encryption |
| EPI | Electronic Privacy Information |
| EPIC | Electronic Privacy Information Center |
| EPOC | Enhanced Protection of Content |
| EQ | Estimation-Quantization (type of coder) |
| ES | Encryption Scheme |
| ESA | Excessive Selective Access |
| ESD | Electronic Secure Delivery |
| ESD | Event Summary Data |
| ESP | Encapsulating Security Payload |
| ESS | Emergency Shutdown System |
| ET | Extended Technology |
| EUSM | End-User Spam Management |
| EUSM | External User Security Model |
| FA | False Alarm |
| FAAP | False Alarm Analysis Program |