Encryption and Decryption
Click the "Start" button on the Server - observe the "Waiting for a
connection" message at the top. Enter a message in the "Text" field
near the bottom or leave the initial message alone.
Click "Send text" button on the Client.
The server shows the ciphertext for 2 seconds in the "Got" field, then
shows the decrypted result in the "Got" field for 4 seconds. Then
the server becomes ready to receive another connection.