---
title: challenge
framework: authenticationservices
role: symbol
role_heading: Instance Property
path: authenticationservices/asauthorizationpublickeycredentialassertionrequest/challenge
---

# challenge

The challenge to sign.

## Declaration

```swift
var challenge: Data { get set }
```

## See Also

### Getting the properties

- [relyingPartyIdentifier](authenticationservices/asauthorizationpublickeycredentialassertionrequest/relyingpartyidentifier.md)
- [allowedCredentials](authenticationservices/asauthorizationpublickeycredentialassertionrequest/allowedcredentials.md)
- [userVerificationPreference](authenticationservices/asauthorizationpublickeycredentialassertionrequest/userverificationpreference.md)