---
title: kSecRevocationPreferCRL
framework: security
role: symbol
role_heading: Global Variable
path: security/ksecrevocationprefercrl
---

# kSecRevocationPreferCRL

Prefer CRL revocation checking over OCSP; by default, OCSP is preferred.

## Declaration

```swift
var kSecRevocationPreferCRL: CFOptionFlags { get }
```