---
title: useSignRevocation
framework: security
role: symbol
role_heading: Type Property
path: security/sectrustsettingskeyusage/usesignrevocation
---

# useSignRevocation

The key can be used to sign an OCSP (online certificate status protocol) message or CRL (certificate verification list), or to verify a signature.

## Declaration

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

## Discussion

Discussion OCSP messages and CRLs are used to revoke certificates.