Personal digital certificate of electronic signature refers to a data message or other electronic record that can prove that the electronic signer is related to the electronic signature making data.
An electronic signature is not a digital image of a written signature. It is actually an electronic code, through which the recipient can easily verify the identity and signature of the sender on the Internet. It can also verify whether the original text of the file has changed during transmission. If someone wants to send important documents to foreign people through the network, both the receiver and the sender need to apply for an electronic license from the licensing authority first. This encryption certificate includes the applicant's public key on the Internet, that is, the "public computer password", which is used for file verification.