Bukkit

Features :

This plugin prevents players from playing without registering to the system. 
Players must be registered to the system in order to play the game.

The important information of the players on the server is hashed with the hash system included in the plugin.

BungeeCord Support !!

Commands :

/login <password> 

/register <password> <password>


DB Configuration:
This plugin also depend on your database configuration.
Here some steps to follow how can you set up this plugin : 
Step 1 : put jar file in plugins folder
Step 2 : restart your server
Step 3 : Configure your config.yml

Example of config.yml :

If you dont have db knowledge here how can you build it :
First thing to do download mysql server and workbench you will be set your root password here
after than u need to create a database in workbench which is named "your_db_name" in example

and copy and run the code below into your mysql workbench. This basically gives permission to plugin execute queries.

CREATE USER IF NOT EXISTS `user_name_exaple`@`%` IDENTIFIED WITH mysql_native_password BY 'password_example';
GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, ALTER, EXECUTE, CREATE VIEW,SHOW VIEW,
CREATE ROUTINE, ALTER ROUTINE, EVENT, TRIGGER ON `database_name`.* TO `user_name_exaple`@`%`;