Such as online banking login, online banking transfer, Taobao payment, tax system payment, electronic signature, process approval, etc.

Digital signature (also known as public key digital signature and electronic signature) is an ordinary physical signature, similar to the signature written on paper, but it is realized by using the technology in the field of public key encryption, which is used to identify digital information. A set of digital signatures usually defines two complementary operations, one for signing and the other for verification.