為何需SSL?自簽的憑證有何不可

https://www.sslshopper.com/why-ssl-the-purpose-of-using-ssl-certificates.html

• 加密 (self-signed is ok) Confidentiality/ Integrity
• 認證 (你能確定連到的是正確的網站）Authentication/ Protection against Re-play Attacks(MITM)