Alteration Detection feature check if video and audio file(MP4) on SD card is changed or not by detection tool.
The certificate used for Alteration detection can be selected from Pre-Installed and CA certificate.
Below is a step-by-step guide to setting up using a CA certificate.

Steps 1-3 are the key generation for CA certificate - CSR generation - CA certificate installation procedure.

Step1 : Generate CRT key (encryption key)
Generate CSR (Certificate Signing Result)

Step2 : Apply and get CA-signed certificate

Step3 : Install the certificate

Step4 : Set Alteration detecting

Please refer to the following video for details.

Alteration detection setup　＜Control No. : P0001＞(YouTube)