---
title: key
framework: accessorytransportextension
role: symbol
role_heading: Instance Property
path: accessorytransportextension/securitymessage/key
---

# key

The key data carried by this message.

## Declaration

```swift
let key: Data
```

## See Also

### Accessing key material

- [keyType](accessorytransportextension/securitymessage/keytype-swift.property.md)
- [SecurityMessage.KeyType](accessorytransportextension/securitymessage/keytype-swift.enum.md)