As a trusted third party in e-commerce transactions, a CA is responsible for validity verification of a public key in a public key system.
A CSR is a file that needs to be submitted to a CA in order to get an SSL certificate. A CSR contains a public key and a distinguished name (DN). Typically, a CSR is generated by a web server, during which a pair of public and private keys is also created for encryption and decryption purposes.
HTTPS is an SSL-based encrypted transmission protocol designed for websites. Simply put, it is the secure version of Hyper Text Transfer Protocol (HTTP).
A public key infrastructure (PKI) is an online infrastructure that is built on an open key theory and technology and is used to provide security services. Using encryption techniques, digital signatures, and digital certificates, it protects the security of applications, communications, or transactions.
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