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On September 1st, 2020, the maximum lifetime of TLS certificates signed by Public Certificate Authority got reduced to 13 months. How did we arrive here, and what’s to come? Let’s start from understanding who decides the maximum lifetime of certificates and many other limitations around them. Who decides the TLS certificate guidelines Ultimately, the client (often a browser or an operating system) identifies the certificate as trustable or not (based on the CA that signed it as well as many othe...