---
title: kSecGuestAttributeSubarchitecture
framework: security
role: symbol
role_heading: Global Variable
path: security/ksecguestattributesubarchitecture
---

# kSecGuestAttributeSubarchitecture

A key whose value is a number representing the CPU subtype under which the guest code is designed to run.

## Declaration

```swift
let kSecGuestAttributeSubarchitecture: CFString
```

## Discussion

Discussion See the ARCH(3) manual page for a list of possible CPU subtypes.