There are essential differences between electronic signature and digital signature. Digital signature is one of the electronic signature technologies, but they are also closely related. At present, the signature mentioned in the Electronic Signature Law usually refers to "digital signature".

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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.

Digital signature is a digital string, which can only be generated by the sender of information, and others can't forge it. This number string is also an effective proof of the authenticity of the information sent by the information sender.