> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/security/security-en/device/verschluesselung-und-zertifikate.md).

# Encryption and Certificates

## HTTPS and TLS

The web interface can be operated with encryption. HTTPS is configurable and must be enabled for this; when HTTPS is active, HTTP is redirected to the encrypted connection.

Supported are **TLS 1.2 and TLS 1.3** with AES-128-GCM, AES-256-GCM, or ChaCha20-Poly1305. Key exchange is performed via ECDHE with `X25519`, `prime256v1` or `secp384r1` or via DHE. Server authentication uses ECDSA or RSA with SHA-256 or SHA-384.

## Certificates

{% tabs %}
{% tab title="Automatic" %}
If desired, the device creates its own certificate based on the curve `prime256v1` with SHA-256. HTTPS can therefore be used without external tools.
{% endtab %}

{% tab title="Own certificate" %}
A customer-owned EC or RSA certificate can be integrated as PEM or PKCS#12. This enables integration into an existing PKI and the use of officially signed certificates.
{% endtab %}
{% endtabs %}

{% hint style="info" %}
Server authentication is only reliable once the certificate or fingerprint has been verified via a trusted path.
{% endhint %}

### Certificate fingerprint

The web interface displays a SHA-1 fingerprint to identify the HTTPS certificate. This is used solely to recognize the certificate and is not used for password verification or signatures.

## Diagnostic archives

Diagnostic archives can optionally be encrypted for a recipient certificate. Used is **CMS/S-MIME with AES-256-CBC**; key transport depends on the public key of the recipient certificate.

{% hint style="info" %}
A diagnostic archive may contain operational data. Transfer it only via trusted paths or in encrypted form. Creation is described under [Create diagnostic file](https://app.gitbook.com/s/TXmRnUpH3eRGvNZHbUed/powerio-system-faq/diagnose-datei-erstellen) .
{% endhint %}

## Settings export

The export of the device settings is only format-obfuscated and offers no cryptographic confidentiality.

{% hint style="warning" %}
An export file contains confidential configuration data. Treat it like a plaintext configuration: store it securely, do not share it, and do not transfer it over insecure channels.
{% endhint %}


---

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