Encrypt Jetson Nano SD Card

Hello, i have a jetson nano which boots on SD Card, my all root files, OS and other files are un 128GB SD card. I want to encrypt it .because i have a mass production. I actually do is clone cards through dd command …how to ecrypt these bootable sd cards???

Our Jetson security only supports with eMMC modules; due to SD card is removeable, it is not supported.
Hope someone can share experience if he has implemented similar function before.

I found zimkey on internet but i dont know how to impelement it …is it worthy?

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