Why a Device Certificate Chain Is More Than a PEM File
When devices connect to a cloud service, they often receive a .crt or .pem file and configure it in a TLS, MQTT, or HTTPS client.
That makes it easy to think a device certificate is just a file. In reality, the certificate is only the visible piece of a trust chain. The real design questions are: how does the device prove who it is, how does the server verify that identity, how is the private key generated and protected, and what happens when the certificate expires or the key leaks.
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