| Abbreviation | Definition |
|---|---|
| SEP | Slashdot Effect Protection |
| SET | Secure Encryption Technology |
| SET | Softcopy Exploitation Tool |
| SF | Signature File |
| SFK | Security Framework Kit |
| SFP | System File Protection |
| SFQL | Structured Firewall Query Language |
| SGC | Server-Gated Cryptography |
| SHA | Secure Hash Algorithm |
| SHTTP | Secure Hyper Text Transfer Protocol |
| SI | Secure Internet |
| SIATA | Security Infrastructure for Agent-based Telecommunication Applications |
| SIC | Secure Identification Chip |
| SIC | System Integrity Check |
| SID | Security In Depth |
| SIM | Secure Intelligent Menu system |
| SIN | Secure Identification Number |
| SISO | Soft-Input Soft-Output |
| SITE | Sign In To Enter |
| SK | Secret Key |