列举一下MySQL的身份验证历史发展的几个链接，供参考

4.1之前：mysql_old_password
https://mariadb.com/docs/server/reference/plugins/authentication-plugins/authentication-plugin-mysql_old_password

https://dev.mysql.com/doc/mysql-security-excerpt/5.7/en/account-upgrades.html


4.1开始：mysql_native_password
https://mariadb.com/docs/server/reference/plugins/authentication-plugins/authentication-plugin-mysql_native_password

5.7开始：sha2
https://dev.mysql.com/doc/mysql-security-excerpt/5.7/en/caching-sha2-pluggable-authentication.html

还有验证协议：https://mariadb.org/history-of-mysql-mariadb-authentication-protocols/