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articles/iot-edge/iot-edge-certs.md

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@@ -148,16 +148,15 @@ If we view the SHA256 thumbprint value for the *EdgeGateway* device registered i
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:::image type="content" source="./media/iot-edge-certs/edge-id-thumbprint.png" alt-text="Screenshot from Azure portal of EdgeGateway device's thumbprint in ContosoIotHub.":::
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> [!NOTE]
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> Device Provisioning Service displays the SHA1 thumbprint for the certificate rather than the SHA256 thumbprint. In this example, we're showing the device certificate SHA256 thumbprint matches the SHA256 thumbprint in IoT Hub.
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In summary, *ContosoIotHub* can trust *EdgeGateway* because *EdgeGateway* presents a valid **IoT Edge device identity certificate** whose thumbprint matches the one registered in IoT Hub.
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For more information about the certificate building process, see [Create and provision an IoT Edge device on Linux using X.509 certificates](how-to-provision-single-device-linux-x509.md).
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> [!NOTE]
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> This example doesn't address Azure IoT Hub Device Provisioning Service (DPS), which has support for X.509 CA authentication with IoT Edge when provisioned with an enrollment group. Using DPS, you upload the CA certificate or an intermediate certificate, the certificate chain is verified, then the device is provisioned. To learn more, see [DPS X.509 certificate attestation](../iot-dps/concepts-x509-attestation.md).
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> In the Azure Portal, DPS displays the SHA1 thumbprint for the certificate rather than the SHA256 thumbprint.
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> DPS registers or updates the SHA256 thumbprint to IoT Hub. You can verify the thumbprint using the command `openssl x509 -in /var/lib/aziot/certd/certs/deviceid-long-random-string.cer -noout -fingerprint -sha256`. Once registered, Iot Edge uses thumbprint authentication with IoT Hub. If the device is reprovisioned and a new certificate is issued, DPS updates IoT Hub with the new thumbprint.
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> IoT Hub currently doesn't support X.509 CA authentication directly with IoT Edge.

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