> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/3d-secure/integrate-d1-sdk/deployment/security-guidelines/security-countermeasures.md).

# Security countermeasures

D1 SDK is designed to provide countermeasures against security threats. The following table shows the list of the known security threats and their corresponding SDK behaviors.

{% hint style="info" %}
If a detection occurs, an `ERROR_DEVICE_ENVIRONMENT_UNSAFE` exception will be thrown.
{% endhint %}

| Security threat          | Description                                                                                                 | Platform     | Build type        |
| ------------------------ | ----------------------------------------------------------------------------------------------------------- | ------------ | ----------------- |
| Root/Jailbreak detection | A rooted or jailbroken device is used to run the application.                                               | Android, iOS | Debug and Release |
| Hook detection           | An attempt is made to hook (intercept) method calls in order to monitor/modify the behavior of the methods. | Android, iOS | Debug and Release |
| Tamper detection         | An attempt is made to tamper with the binary data.                                                          | Android, iOS | Debug and Release |
| Emulator detection       | An Android emulator is used to run the application.                                                         | Android      | Debug and Release |
| Debugger detection       | An attempt is made to reverse engineer the application by attaching a debugger.                             | Android, iOS | Release           |


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