| Abbreviation | Definition |
|---|---|
| PD | Parallel Decode |
| PE | Privacy-Enhanced |
| PED | Programmable Encryption Device |
| PEF | Password Encrypted Format |
| PEF | Plain English Firewall |
| PENS | Portcullis Enterprise Network Security |
| PES | Proposed Encryption Standard |
| PF | Packet Filter |
| PFS | Perfect Forward Secrecy |
| PG | Privacy Guard |
| PGPI | Pretty Good Privacy for the Internet |
| PHH | Project Honeypots and Honeynets |
| PHI | Protected Health Information |
| PI | Personal Information |
| PIC | Position Idependent Code |
| PICS | Personal Information Communication Storage |
| PID | Personal Identity Digit |
| PIE | Propagation Infection and Execution |
| PIM | Personal Information Manual |
| PIMS | Personal Information Management System |