Before telling you the application scope, let me tell you the function of digital signature: digital signature is to encrypt the abstract of data by using the private key of digital certificate to ensure the integrity, authenticity and non-repudiation of data.

Digital signature is the most reliable and critical method to ensure data integrity, authenticity and non-repudiation. Where it is needed, it can be applied.

Now the typical applications are: online banking, e-commerce, e-government, network communication and so on.