| Abbreviation | Definition |
|---|---|
| SPC | Software Protection Code |
| SPD | Security Policy Distribution |
| SPDR | Secure Protected Development Repository |
| SPDS | Sealed Parcel Delivery System |
| SPEAR | Security Protocol Engineering and Analysis Resource |
| SPEE | Special Purpose Encryption Equipment |
| SPEED | Secure Package for Encrypting Electronic Data |
| SPEWS | Spam Prevention and Early Warning System |
| SPG | Sequence Password Generator |
| SPI | Security Parameters Index |
| SPIN | Secure Personal Identification Number |
| SPK | Simple Public Key |
| SPKI | Simple Public Key Infrastructure |
| SPKM | Simple Public Key Mechanism |
| SPL | Security Protocol Language |
| SPM | Spy Password Manager |
| SPMP | Site Protection Management Plan |
| SPOE | System Point Of Entry |
| SPU | Secure Processing Unit |
| SR | Security and Replication |