---
title: attrSmimeEncryptionKeyPrefs
framework: security
role: symbol
role_heading: Type Property
path: security/cmssignedattributes/attrsmimeencryptionkeyprefs
---

# attrSmimeEncryptionKeyPrefs

Indicate that the signing certificate included with the message is the preferred one for S/MIME encryption.

## Declaration

```swift
static var attrSmimeEncryptionKeyPrefs: CMSSignedAttributes { get }
```