Formats of security certificates

While I was integrating wolfSSL in a project, I had to study its possibilities to import or export keys and certificates. I came across different formats of security certificates which were unfamiliar. I thought that it would be interesting to share what I learned.

wolfSSL is a lightweight SSL/TLS library targeted at, among others, embedded environments. It provides APIs for several ciphers that allow a strong and secure end-to-end encryption and can exploit the cryptographic hardware units of some SoC.

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While looking for new embedded real-time operating systems, I came across the Zephyr Project. As it offers a wide range of possibilities for IoT, I thought that it would be very interesting to investigate it deeper. Let’s try to enable a BLE Environmental Sensing Service with Zephyr RTOS.

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