How to realize the originality, integrity, traceability and non-repudiation of electronic documents through digital signature?

The file receiver uses the public key provided by the other party to interpret the digital signature, and the interpretation result is used to verify the integrity of the file to confirm the integrity of the electronic file. Digital signature itself is anti-denial, and the source of digital signature can directly resist the other party's denial of the source of information. In order to realize the above functions, digital signature is based on public key encryption technology, namely public key and private key. The public key can be made public at will, and the private key is kept strictly confidential.