Introduction - If you have any usage issues, please Google them yourself
DSA digital signature
System functional requirements:
1. Sign the document and generate a signature file independent of the original text.
2. The document can be signed and the signature information can be added after the document.
3. It has the function of key management, such as key generation, import and export.
4. Word documents can be operated and the contents of Word documents can be signed.
5. Ability to compare existing signatures and prevent duplicate signatures to prevent replay attacks;
6. It is possible to separate the source file from the signature information of the signed file.