This idea of solving the problem of document signature belongs to SaaS scheme, so we call it "DSA as" (document signature as a service).
As shown in the above figure, the user only needs to use the document signing service provided by Mi Xin App to select the document to be signed, and Mi Xin App will automatically connect to the cloud authentication system to verify the user's identity, and automatically apply for the document signing certificate from the cloud CA system and the cloud key management system. At the same time, Mi Xin App will generate the abstract data of the document to be signed on the local computer and submit it to the cloud electronic signature service system. The cloud electronic signature service system will automatically call the user's document signature certificate to digitally sign the abstract data, and automatically call the cloud timestamp service to attach timestamp data to the signed abstract data. At the same time, the certificate revocation system data is called to generate LTV data, which ensures that even if the certificate signed by the document expires in the future, the signature is still valid; Finally, these data are combined into signature data according to international standards and national standards and returned to the secret letter App. Secret letter App completes the digital signature of documents locally, and the signed documents have global trust and national compliance.
That is to say, as a cloud service, my signed document digital signature service (DSaaS) can be used at any time like tap water, which completely solves the usability problem of document digital signature and truly realizes one-click digital signature of documents, thus popularizing the digital signature of electronic documents and ensuring that every document is credible.