| SHTTP | Secure HTTP |
| SAK | Secure Attention Key |
| SSH | Secure Shell |
| SCP | Secure Copy |
| SMIME | Secure MIME |
| CSVPN | Cisco Secure VPN |
| cqr | secure [anchor] |
| SMI | Secure Monitor Interrupt |
| SD | Secure Digital [Card] |
| SDC | Secure Digital Card |
| SET | Secure Electronic Transaction |
| SHA | Secure Hash Algorithm |
| SPD | Secure Payload Database |
| SPA | Secure Password Authentication |
| SIP | Secure Internet Programming |
| SMC | Secure Messaging Card |
| SES | Secure Easy Setup |
| SAP | Secure Audio Path |
| SSN | Secure Server Network |
| STID | Secure Table Identifier |
| SVP | Secure Video Processor |
| SSL | Secure Sockets Layer |
| SSL | Secure Server Line |
| SRT | Secure Request Technology |
| SPS | Secure Packet Shield |
| STT | Secure Transaction Technology |
| SVPN | Secure Virtual Private Network |
| SILC | Secure Internet Live Conferencing |
| SSRI | Secure Storage and Retrieval of Information |
| SNCS | Secure Network Computer Server |
| SRTP | Secure Realtime Transport Protocol |
| SWAN | Secure Wide Area Network |
| SHIT | Secure Home Internet Telephony |
| CSPFA | Cisco Secure PIX Firewall Advanced |
| CSPFF | Cisco Secure PIX Firewall Fundamentals |
| DISNet | Defense Integrated Secure Network |
| JSSE | Java Secure Socket Extension |
| NGSCB | Next-Generation Secure Computing Base |
| BSSID | Basic Secure Set Identifier [engl.] Verschlüsselungssystem |
| SACNET | Secure Automated Communications Network |
| SAML | Secure Assersation Markup Language Sicherheitsstandard im Internet |
| SEMPER | Secure Electronic Marketplace for Europe |
| SEPP | Secure Electronic Payment Protocol |
| SDMI | Secure Digital Music Initiative |
| SFPS | Secure Fast Packet Switching |
| SDNS | Secure Data Network Service / System |
| NGSCBFW | Next Generation Secure Computing Base for Windows |
| CSIDS | Cisco Secure Intrusion Detection System |
| DISCO | Digital Secure Communication [Bosch/Ascom] |
| SFS | Scalable / Secure File Share / System |