Secure your Arduino IoT network using Raspberry Pi and Nginx. via abarbanell.de
As a general rule, all API calls to your backend should always be encrypted with https (SSL/TLS), this applies for IOT scenarios just the same as for internet traffic in general. However, if you use cost-effective microcontrollers like Arduino or ESP8266, there is not enough computing horsepower to encrypt the traffic, or even enough memory to store the code for proper SSL/TLS handshake algorithms. So you loose out or you need to move to more expensive hardware.
This problem is listed as number 4 in the top 10 security vulnerabilities for IOT on the OWASP website, so I did not want to send the data from my home sensors unencrypted into the world.
Here I will describe a nice and elegant solution which solved this problem for me.
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