---
title: useKeyExchange
framework: security
role: symbol
role_heading: Type Property
path: security/sectrustsettingskeyusage/usekeyexchange
---

# useKeyExchange

The key is a private key that has been shared using a key exchange protocol, such as Diffie-Hellman key exchange.

## Declaration

```swift
static var useKeyExchange: SecTrustSettingsKeyUsage { get }
```