Electronic signature is generated under the background of Internet. In 2005, the "Electronic Signature Law" officially landed, and it was legally "verified". Article 2 of the Electronic Signature Law: The term "electronic signature" as mentioned in this Law refers to the data contained in a data message, which is used to identify the identity of the signer and show that the signer approves its contents.

Electronic signature has two characteristics: one is to identify the identity of the signer; Second, it means that the signer approves the contents of the signed document.

At present, there are many technologies to realize electronic signature (that is, to sign an electronic file and ensure its identification and approval functions), one of which is digital signature technology based on public key cryptography.

According to the relevant provisions of the Electronic Signature Law, an electronic contract signed with a reliable electronic signature has the same legal effect as a paper contract signed or sealed by hand.

According to Article 14 of the Electronic Signature Law, a reliable electronic signature has the same legal effect as a handwritten signature. At the same time, article 13 stipulates that an electronic signature can only be regarded as reliable if it meets the following conditions:

(1) When electronic signature production data is used for electronic signature, it belongs exclusively to the electronic signer;

(2) When signing, the electronic signature production data is only controlled by the electronic signer;

(3) Any changes to the electronic signature after signature can be found;

(4) Any changes to the content and form of the data message after signature can be found.

Article 16 stipulates that if the electronic signature needs third-party authentication, the legally established electronic authentication service provider shall provide authentication services.

Choosing a reliable third-party electronic contract conclusion system can sign an effective electronic contract. This is also in line with the provisions of the Ministry of Commerce in the Procedures for Online Concluding of Electronic Contracts: "Only when an electronic contract is concluded through the electronic contract conclusion system of a third party (electronic contract service provider) can the fairness of the process and the effectiveness of the results be guaranteed".