The ssl certificate generated by 1. has not been authenticated and is illegal. The purchased SSL certificate is an SSL certificate issued by CA institutions such as WoSign CA, and CA institutions must pass the international webtrust certification and electronic distribution law.

2. The browser does not trust the SSL certificate generated by itself, which will prevent access; The purchased SSL certificate is trusted by the browser, showing a green security lock;

3. Self-generated SSL certificates are easy to be forged and counterfeited, attacked by middlemen and unsafe. The purchased SSL certificate is more secure and credible.

For example:

Self-generated SSL certificates, just like self-made ID cards, can't be approved by anyone and institutions.

The purchased SSL certificate, just like the ID card issued by the Public Security Bureau, is globally recognized, and shopping, credit card and accommodation have passed smoothly. If you violate discipline, the Public Security Bureau can find your ID card revoked or marked.

References:

/FAQ/self signed _ SSL _ secure . htm