---
type: source
title: "Multifunctional Chip Card: Access Control"
tags: [access-control, chip-card, security]
related: [multifunktionale-chipkarte, elektronisches-zutrittskontrollsystem-ezks]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_sonstiges_multifunktionale_chipkarte_zutr.md"]
---

# Multifunctional Chip Card: Access Control

This source provides detailed information regarding the electronic access control system (eZKS) at the Universität Greifswald, specifically how the multifunctional chip card is used for building and area access.

## Key Technical Details
- **Personalization**: Cards include the user's name, photo, and URZ username to enhance security and identification.
- **Data Storage**: No personal data is stored on the card itself; it contains a unique ID, access rights, and validity dates. Personal data is linked within the central eZKS system.
- **Lock Types**:
    - **Online Locks**: Connected to the network, allowing real-time verification and card updates.
    - **Offline Locks**: Rely on stored card data; require an update via an online lock every **7 days** to remain valid.
- **Update Points**: Specific online locks (e.g., building entrances, barriers) serve as automatic update points for the cards.

## Administrative Policies
- **Access Termination**: Physical access is revoked the day after an employment contract expires, regardless of the status of the URZ user account.
- **Card Loss**: Lost cards must be reported immediately via the hotline (+49 3834 420 2273) or the [[groupware]] ticket system. The URZ username is required for blocking.
- **Log Data**: The system records usage (when/where) and update success for administrative purposes, but does not create user profiles.

## LED Feedback System
- **Green**: Access granted.
- **Blue**: Card is being updated (Online locks only).
- **Red**: Access denied.
- **No light**: Card temporarily deactivated due to excessive errors (usually resets in 1-2 hours).
