Currently, various PDF/OFD documents do not have digital signatures. Some documents may have an electronic seal. These documents without digital signatures are documents that cannot be trusted because anyone can easily Pretend to be a unit to publish such documents, or even counterfeit and tamper with official documents issued by the government. How to ensure that the identity of the publisher of various electronic documents/official documents is credible is not only a compliance issue, but also a huge security risk. It is very easy for people to be deceived, lose money or even lose their lives. This is a problem in business management without Problems that must be solved during paper transformation.

The only feasible solution at present is to use digital signatures on electronic documents to ensure that the identity of the document publisher is credible and that the document will not be illegally tampered with or illegally counterfeited. my country's "Electronic Signature Law" has clarified that the legal effect of a reliable electronic signature is equal to a handwritten signature and an entity's seal. This reliable electronic signature refers to a digital signature. Digital signature uses a digital certificate to verify the identity of the signer, and binds the signer's identity to the document through a cryptographic algorithm to prove the non-repudiation of the signing behavior. The signed document does not need to contain an audit report of the signing process, and the signer's identity verification is This is done by a Certificate Authority (CA) or Trusted Service Provider (TSP).

(1) Preparation tools:

1. PDF signature certificate;

2. Adobe Acrobat software;

3. Waiting Signed PDF document.

(2) Open the Adobe Acrobat software and configure the timestamp

The timestamp is a trusted time source that can prove the trusted time when the document was signed. If no timestamp is added, the PDF electronic signature uses the computer's local time by default.

(3) Use Adobe? Acobat software to electronically sign PDF documents

After configuring the timestamp, we can digitally sign the document. The signing steps and after signing The document pictures are as follows:

①?Select the signature certificate and appearance

②?Sign the completed PDF document