Design User System

Scenario:

• Log in/out
• Register/Remove
• Update
• Forgot Password

Necessity:

• No of Users
• No of Peak users
• Frequency of operators

Database (User Table):

• long userID; P_KEY & Index
• string userName; //max length as 50
• string hiddenPass; //Not revertible and not easy to break using a brute force way (e.g. Hash).
•                               //On-side encryption is not a good idea.
•                               //Encryption with private key is still used (e.g. SSH).
• int status; //activated? ban?

In Memory:

• class User {
• long userID; //P_KEY
• string userName;
• string hiddenPass;
• int status;
• }
• 
  
• class Session {
• long sessionID; //P_KEY
• long userID;
• int devideType;
• long timeOut; //ms
• }