| PAP | Password Authentication Protocol |
| SPAP | Shiva Password Authentication Protocol |
| SPA | Secure Password Authentication |
| EAPOL | Extensible Authentication Protocol Over LAN |
| EAP | Extensible Authentication Protocol |
| PEAP | Protected Extensible Authentication Protocol |
| CHAP | Cryptographic Handshake Authentication Protocol Kryptographisches Authentifizierungsprotokoll |
| CHAP | Challenge Handshake Authentication Protocol Authentifizierungsprotokoll |
| EAPOE | Extensible Authentication Protocol Over Ethernet |
| LEAP | Lightweight Extensible Authentication Protocol |
| PWL | Password List |
| PMS | Password Management System |
| vue | Validating Password-File [Win 95] eine Dateiendung |
| MCOP | Mobile Connect One-time Password |
| COPS | Computer Oracle and Password System |
| APG | Automated Password Generator [engl.] |
| pwl | Symbol Or Password Init [Paßwort-Dateien] eine Dateiendung |
| MDA | Mediated Digest Authentication |
| AS | Authentication Server [engl.] |
| DAA | Digest Access Authentication |
| PAM | Pluggable Authentication Module |
| AUC | Authentication Center [engl.] |
| AH | Authentication Header [engl.] Authentifizierung für Daten und IP-Header |
| RPA | Remote Passphrase Authentication |
| CRAM | Challenge Response Authentication Mechanism |
| UAM | User Authentication Method / Module |
| NMAS | Novell Modular Authentication Services |
| DASS | Ditributed Authentication Security Service |
| MASS | Message Authentication Signature Standard |
| AUC | Authentication/Authority Centre [engl.] |
| HMAC | Hash Message Authentication Code |
| WAPI | Wireless Authentication and Privacy Infrastructure |
| JAAS | Java Authentication and Authorization Service |
| SASL | Simple Authentication and Security Layer |
| HAAPI | Human Authentication Application Program Interface |
| RADIUS | Remote Authentication Dial In User Service |
| RADIUS | Remote Access / Authentication Dial-In User Service |
| MAPTOP | "Manufacturing Automation Protocol/Technical Office Protocol, ""MAP/TOP""" |
| IPCP | Internet Protocol Control Protocol |
| IPSEC | Internet Protocol Security Protocol |
| PEP | Protocol Extension Protocol |
| TCP/IP | Transmission Control Protocol / Internet Protocol [Internet] |
| ICIP | ICI Protocol |
| FOIP | Fax Over Internet Protocol |
| JMP | Job Monitor Protocol |
| CCP | CAN Calibration Protocol |
| TPID | Tag Protocol Identifier 16-Bit Datenfeld |
| IPIP | Internet Protocol within Internet Protocol |
| MP | Multilink Protocol |
| IP | Internet Protocol [TCP/IP] |