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# ENTemporaryExposureKey

The key used to generate rolling proximity identifiers.

```
class ENTemporaryExposureKey
```

## Overview> Important:
> This class is available in iOS 12.5, and in iOS 13.5 and later.

Upon a positive diagnosis, the user is allowed to submit their temporary exposure keys to their Health Authority server as diagnosis keys. Use [`getDiagnosisKeys(completionHandler:)`](/documentation/ExposureNotification/ENManager/getDiagnosisKeys(completionHandler:)) to obtain the user’s diagnosis keys for submission.

## Topics

### Exposure Criteria

[`transmissionRiskLevel`](/documentation/ExposureNotification/ENTemporaryExposureKey/transmissionRiskLevel)

The risk of transmission associated with the person a key came from.

[`rollingPeriod`](/documentation/ExposureNotification/ENTemporaryExposureKey/rollingPeriod)

The length of time that this key is valid.

[`keyData`](/documentation/ExposureNotification/ENTemporaryExposureKey/keyData)

The temporary exposure key information.

[`rollingStartNumber`](/documentation/ExposureNotification/ENTemporaryExposureKey/rollingStartNumber)

A number that indicates when a key’s rolling period started.

[`ENIntervalNumber`](/documentation/ExposureNotification/ENIntervalNumber)

A number assigned to each 10-minute window shared between all devices participating in the protocol.


---

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