Legal analysis: if an electronic signature meets the following conditions at the same time, it is still valid even if there is no autograph: when the electronic signature data is used for electronic signature, it belongs to the electronic signer; When signing, the electronic signature production data is only controlled by the electronic signer; Any changes to the electronic signature after signing can be found; Any changes to the content and form of the data message after signing can be found.

Legal basis: People's Republic of China (PRC) Electronic Signature Law.

Thirteenth electronic signatures meet the following conditions at the same time, as reliable:

(1) When the electronic signature production data is used for electronic signature, it belongs to the exclusive rights of 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.

The parties can also choose to use electronic signatures that meet their agreed reliable conditions.

Article 14 A reliable electronic signature has the same legal effect as a handwritten signature or seal.

Article 15 An electronic signer shall properly keep the electronic signature making data. When the electronic signer knows that the electronic signature production data has been or may have been compromised, he shall promptly inform the relevant parties and stop using the electronic signature production data.