A reliable electronic signature needs to meet five conditions before it can have the same legal effect as a handwritten signature. First, companies that issue signatures need the "Electronic Certification Service License" from the Ministry of Industry and Information Technology. Currently, more than 30 companies, including Tianwei Integrity Digital Certification Center, have obtained it. Second, the key used for electronic signatures must belong to the signer. Third, the signer has control over the key. Fourth, digital signature changes after signing can be discovered. Fifth, any modifications to the electronic content after signing can be checked. Only when you meet these five points can you sign reliably. You see, it's either a drawing of a picture and a seal or an electronic signature. ]