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What is a CA digital certificate and what is its purpose?
CA, the certification authority, is a trusted third party in e-commerce transactions.

When the user passes the real-name authentication of the third-party electronic signature platform, he can obtain the digital certificate issued by the CA organization cooperating with the third-party electronic signature platform as the basis of the user's online identity certificate.

Certificates are based on digital signature technology, so they cannot be forged or tampered with.