---
type: entity
title: DFN-Adressbuch
tags: [directory, pki, dfn]
related: [dfn-pki-zertifikate, outlook-smime-usage]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_e_mail_e_mail_sicherheit_cert_outlook.md"]
---

# DFN-Adressbuch

The **DFN-Adressbuch** is a centralized directory service used by participants of the **DFN-PKI** (German National Research and Education Network Public Key Infrastructure).

## Purpose
Its primary purpose in the context of email security is to provide a reliable source for retrieving the **public keys** of other DFN-PKI certificate holders. This allows users to encrypt emails for recipients without needing to first receive a signed email from them.

## Integration
The DFN-Adressbuch can be integrated into email clients such as [[microsoft-outlook]] to facilitate the encryption process by allowing users to select recipients directly from the directory.