---
title: System Identity Domains
framework: security
role: collectionGroup
role_heading: API Collection
path: security/system-identity-domains
---

# System Identity Domains

Set or obtain a system identity for domains.

## Overview

Overview These constants can be used with the SecIdentitySetSystemIdentity(_:_:) and SecIdentityCopySystemIdentity(_:_:_:) functions.

## Topics

### Constants

- [kSecIdentityDomainDefault](security/ksecidentitydomaindefault.md)
- [kSecIdentityDomainKerberosKDC](security/ksecidentitydomainkerberoskdc.md)