| Abbreviation | Definition |
|---|---|
| RAT | Remote Access Trojan |
| RBL | Real-Time Block List |
| RBS | Remote Backup Software |
| RC | Rivest Cipher |
| RC | Ron's Cipher |
| RCE | Region Content Encryption |
| RDC | Random Data Compression |
| RDE | Randomized Data Encryption |
| RDES | Randomized Data Encryption Standard |
| RES | Revised Encoding Scheme |
| RIC | Recognizable Interchangeable Combinations |
| RIMS | Remote Intelligent Monitoring System |
| RIP | Regulated Interaction Protocol |
| RKE | Remote Keyless Entry |
| RKP | Relative Key Position |
| RKS | Random Keys Scheme |
| RKSS | Random Key Spaces Scheme |
| RLN | Release Lock Number |
| RMF | Reputation Management Framework |
| RO | Ring Out |