How pda implements ca signature

Cannot be implemented. ca is the abbreviation of CertificateAuthority, which means "certificate authentication". pda is also called a handheld computer, which can help us complete work, study, entertainment, etc. on the move. It means personal digital assistant, which is a digital tool to assist personal work. , mainly providing note-taking and communication functions.

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To handle the integration of three certificates, as long as the handler has a personal digital certificate or a U shield of the bank and the organization number of the company.