---
title: kSecPolicyKU_CRLSign
framework: security
role: symbol
role_heading: Global Variable
path: security/ksecpolicyku_crlsign
---

# kSecPolicyKU_CRLSign

If true, the certificate’s key usage must allow it to be used for signing certificate revocation lists (CRLs).

## Declaration

```swift
let kSecPolicyKU_CRLSign: CFString
```