| Abbreviation | Definition |
|---|---|
| ILE | In-Line network Encryption |
| ILRT | Industry Loss Reduction Team |
| ILS | Internet Locator Server |
| IM | Instant Messenger |
| IMP | Identifying, Monitoring, and Protecting |
| IMSS | Interscan Messaging Security Suite |
| INE | Improved Network Encryption |
| INES | Improved Network Encryption System |
| INSS | Internal Network Security Sweep |
| IOC | Indicator of Compromise |
| IOC | Infrastructure Operating Center |
| IP | Ingress Protection |
| IPC | Internet Privacy Coalition |
| IPC | Internet Protection Community |
| IPEM | Internet Privacy Enhanced Mail |
| IPES | Improved Proposed Encryption Standard |
| IPKI | Internet X.509 Public Key Infrastructure |
| IPL | Interim Parts Library |
| IPP | Identity Preservation Program |
| IPS | Intrusion Prevention System |