What is a private key for a certificate?
The private key is a separate file that's used in the encryption/decryption of data sent between your server and the connecting clients. A private key is created by you — the certificate owner — when you request your certificate with a Certificate Signing Request (CSR).
Does client certificate authentication require private key?
For both server and client authentication, the server needs: The personal certificate issued to the server by CA Y. The server's private key. The CA certificate for CA X.