1. The user accesses the business system on the mobile phone, selects the collaborative certificate authentication login, and uses the digital certificate provided by the collaborative signature APP to authorize login.

2. Access the business system on the PC side, and select trusted authentication to log in. The business system generates a secure and reliable QR code, and the user uses the collaborative signature APP to scan the QR code for authorized login.

3. When logging in to the collaborative signature APP, the user signs the key data pushed by the business system based on the digital certificate of the collaborative signature APP or the scanning mode of the digital certificate to ensure that the business data is legal and effective.