| Abbreviation | Definition |
|---|---|
| PKU | Public Key Unit |
| PME | Protection, Mitigation, and Enhancement |
| PMS | Possible Malicious Software |
| PNE | Password Never Expires |
| PNP | Plug aNd Play |
| PNR | Personal Name Record |
| PPA | Privacy Protection Act of 1980 |
| PPE | Prefix-Preserving Encryption |
| PPI | Protected Personal Information |
| PPK | Previous Page Key |
| PPKC | Probabilistic Public Key Cryptosystem |
| PPP | Protect Proper Patch |
| PR | Password Recovery |
| PRK | Password Recovery Key |
| PRL | Password Recovery List |
| PRP | Pseuro- Random Permutation |
| PSAE | Publish-Subscribe Authentication and Encryption |
| PSC | Personal Security Code |
| PSIM | Physical Security Information Management |
| PSK | Pre-Shared Key |