Isaac Marino Bavaresco wrote:
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I use AES (128-bit symmetric key cryptography) with authentication, so
nobody else can upload anything to my hardware.
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Do you think the standard Microchip libraries are good enough to use in a 
simple bootloader?

http://ww1.microchip.com/downloads/en/AppNotes/01044a.pdf

I'm not familiar with the AES algorithm, what would be the penalty in going 
from 128-bit to 256-bit encryption, in terms of execution speed and code 
size?

Vitaliy

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