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There are a number of certificate extensions in the structure of a certificate. In this article, we will discuss the Basic Constraints certificate extensions. The details corresponding to Basic Constraints can be found in the following RFC:
Let’s discuss Subject types as CA Certificates.
Let’s discuss Subject types as End Entity Certificates
Let’s discuss Path Length in the image below
In the certificate chain diagram above, the first certificate specifies a path length constraint 2 which means there could be a maximum of 2 CA certificates under this certificate, other than the end entity certificate.