The device has MCU with SD card & USB in MSC Device mode. I am storing data on SD card in csv fatfs format. The data from SD card can be read on computer by making connecting with USB.

Now I want to encrypt the data so only my GUI application software on computer can read the csv files, otherwise anyone can open the stored csv file.

I have no experience with encyption and have tried to search on forum and see few posts but don’t see the direction.

All I know is .bin format is used but how to use that to store data and read .. is a mystery for me…