---
title: securityDomainAID
framework: secureelementcredential
role: symbol
role_heading: Instance Property
path: secureelementcredential/credentialsession/credential/instanceinfo/securitydomainaid
---

# securityDomainAID

The unique identifier of the security domain you use to install the instance.

## Declaration

```swift
let securityDomainAID: Data
```

## Discussion

Discussion Use this identifier when selecting the security domain to perform data transceive with, such as forming a Secure Channel Protocol 3 (SCP03) channel.

## See Also

### Creating a secure channel

- [securityDomainKeyInfo](secureelementcredential/credentialsession/credential/instanceinfo/securitydomainkeyinfo.md)