> I have an aplication that uses authentication (Users and passwords). I have a complain from one of my clients that what ever passwords he made thers one guy he has a small program he uses to review and reveal any passwords entered through the keyboard.
>
> How can I prptect my client and prevent the revealing of the passwords ?

Sir,
Think about a password that -
1. Not stored any where
2. Changes everyday
3. Changes every minute
Means the password can be a combination of date & time + some other condition
for example
x is the user input
if x= day(date) + hour(time) * 2
user password is correct
else
user password is wrong
Only the user knows about the combination which opens the program.
We can hard code the above into our program.
There is no boundary for imagination.
With Regards,
Biju Thomas