There is no current digital certificate client, or the client is damaged and needs to be reinstalled; There is something wrong with the CA certificate. Try another computer. If the verification still fails, you need to go to the tax bureau to reissue a CA certificate.

1.CA also has a certificate (including a public key and a private key). Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.

2. Solution: Change the line, search for "Jilin Provincial State Taxation Bureau" in Baidu to enter official website, select "Online Declaration" under "I want to declare tax", click "Unicom Line" or "Telecom Line" to enter the "Jilin Provincial State Taxation Bureau Online Declaration Platform" interface; Pull out the USB flash drive and insert it again, and declare login again; Pull out the USB flash drive to restart the computer, then insert the USB flash drive again, and click declare to log in.

3. Uninstall the driver and support platform to download and install again; Operating Steps and Precautions: Unplug the USB plug when uninstalling and installing the driver and supporting platform.

4. Certificate Authority (CA), also known as E-commerce Certification Center, is the authority responsible for issuing and managing digital certificates. As a trusted third party in e-commerce transactions, CA is responsible for verifying the legitimacy of public keys in public key systems.

5.CA Center issues a digital certificate to each user who uses the public key. The function of digital certificate is to prove that the user listed in the certificate legally owns the public key listed in the certificate. The digital signature of CA makes it impossible for attackers to forge and tamper with certificates. In SET transaction, CA not only issues certificates to cardholders and merchants, but also issues certificates to banks and gateways that collect money.