You can not display *s while entering a password with sudo on the terminal, without changing source code. You can however easily make sudo pop up a graphical dialog.
Create a file called askpass.sh in your home folder. Edit it, and put the following in it:
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#!/bin/sh
/usr/bin/zenity --entry --hide-text --text="Enter password:" --title="sudo"
Make the file executable (chmod +x askpass.sh).
Edit (or create) the file .bashrc in your home folder (gedit ~/.bashrc) and put this line at the end:
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export SUDO_ASKPASS=~/askpass.sh
alias suda='sudo -A'
Now any time you run a command with "sud
a command" instead of as "sud
o command", it uses askpass.sh to ask you for your password. It pop ups a small dialog window where you can enter your password, and it will show *s.