---
type: source
title: "2FA mit TOTP (Two-Factor Authentication with TOTP)"
tags: [2fa, totp, security, authentication]
related: [2-factor-authentication, totp]
created: 2026-07-01
updated: 2026-07-01
sources: ["output/rz_uni_greifswald_de_support_dokumentation_anleitungen_2fa_mit_totp.md"]
---

# 2FA mit TOTP

This source provides an introductory guide to the implementation of Two-Factor Authentication (2FA) using the Time-based One-Time Password (TOTP) standard at the Universität Greifswald.

## Key Provisions

### Security Strategy
The Universitätsrechenzentrum (URZ) utilizes TOTP as a balance between security and user-friendliness. Because TOTP is an open standard, users are permitted to choose their own compatible software.

### Recommended Software
The URZ recommends the following tools for generating TOTP codes:
- **Desktop/Laptops**: [[keepassxc]] (a full-featured password manager).
- **Mobile Devices**: [[freeotp]] (a dedicated TOTP application).

### Deployment
For devices installed via [[opsi]], **KeePassXC** is provided as a standard pre-installed application.

### Technical Terminology
The guide defines two critical components of the TOTP process:
- **TOTP-Secret**: The secret key generated by the protected application and stored within the user's TOTP-capable app.
- **TOTP-Code**: A typically 6-digit numeric code valid for a maximum of 30 seconds, calculated based on the TOTP-Secret and the exact current time.

## Related Documentation
The source references further detailed guides (not contained in this specific document) regarding:
- 2FA Prerequisites
- 2FA Setup
- TOTP Code Retrieval
- Second Device Preparation (Redundancy)
- FAQ
