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Secure firmware upgrade

Hello,

I am working on in application programming using STM32F105.
I read this application note about secure firmware upgrade www.st.com/.../DM00044227.pdf

So what i am thinking about is that i have to make encryption for the code that i wrote, and not the data the microcontroller may send to some peripheral.
How can i make this? is there any configuration that i can make to tell the complier to make code encryption with some encryption key?

Regards,
Hisham

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