Chat Server with RSA and MD5 for message integrity using Java

This application is used for sending messages from one client to all clients. In this, server takes a message from the sender client and sends it to all clients. If any client wants to join the chatting then he runs the client application on client side, enters the login name and hits the login button and starts the chatting with every client. If any client joins the chatting system then the message “User_Name has Logged in” comes on the message list box of every client window. Same like this, if any client exit from the chatting then the message “User_Name has Logged Out” comes on the message list box of every client window. In this we are maintaining the list of user names (client name) also. After creating the connection with server, client sends the user name to server and server store it in the arraylist and sends this arraylist to all clients. Same like this when any client has logged out then server remove this name from the arraylist and send this updated arraylist to every client. This application is used for sending messages from one client to all clients. In this, server takes a message from the sender client and sends it to all clients. If any client wants to join the chatting then he runs the client application on client side, enters the login name and hits the login button and starts the chatting with every client. If any client joins the chatting system then the message “User_Name has Logged in” comes on the message list box of every client window. Same like this, if any client exit from the chatting then the message “User_Name has Logged Out” comes on the message list box of every client window. In this we are maintaining the list of user names (client name) also. After creating the connection with server, client sends the user name to server and server store it in the arraylist and sends this arraylist to all clients. Same like this when any client has logged out then server remove this name from the arraylist and send this updated arraylist to every client.