---
title: Usage Constraints Dictionary Keys
framework: security
role: collectionGroup
role_heading: API Collection
path: security/usage-constraints-dictionary-keys
---

# Usage Constraints Dictionary Keys

Use these trust settings keys in a usage constraints dictionary.

## Topics

### Constants

- [kSecTrustSettingsPolicy](security/ksectrustsettingspolicy.md)
- [kSecTrustSettingsApplication](security/ksectrustsettingsapplication.md)
- [kSecTrustSettingsPolicyString](security/ksectrustsettingspolicystring.md)
- [kSecTrustSettingsKeyUsage](security/ksectrustsettingskeyusage.md)
- [kSecTrustSettingsAllowedError](security/ksectrustsettingsallowederror.md)
- [kSecTrustSettingsResult](security/ksectrustsettingsresult.md)