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# NEVPNIKEAuthenticationMethod

Internet Key Exchange (IKE) authentication methods used to authenticate with the IPSec server.

```
enum NEVPNIKEAuthenticationMethod
```

## Topics

### Authentication methods

[`NEVPNIKEAuthenticationMethod.none`](/documentation/NetworkExtension/NEVPNIKEAuthenticationMethod/none)

Do not authenticate with the IPSec server. Note that extended authentication may still be performed if the [`useExtendedAuthentication`](/documentation/NetworkExtension/NEVPNProtocolIPSec/useExtendedAuthentication) property is set. This value is only valid for IKE version 2 (IKEv2)

[`NEVPNIKEAuthenticationMethod.certificate`](/documentation/NetworkExtension/NEVPNIKEAuthenticationMethod/certificate)

Use a certificate and private key as the authentication credential. The certificate and private key set in the [`identityReference`](/documentation/NetworkExtension/NEVPNProtocol/identityReference) or [`identityData`](/documentation/NetworkExtension/NEVPNProtocol/identityData) property will be used.

[`NEVPNIKEAuthenticationMethod.sharedSecret`](/documentation/NetworkExtension/NEVPNIKEAuthenticationMethod/sharedSecret)

Use a shared secret as the authentication credential. The shared secret set in the [`sharedSecretReference`](/documentation/NetworkExtension/NEVPNProtocolIPSec/sharedSecretReference) property will be used.


---

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