Plugin for a password-protected login-area?

Hi everybody!

I am seeking a plugin in order to install a password-protected area.

e.g.

(please check “LOGIN” at the upper right side)

I do need, however, a plugin where I can create at least TEN different passwords for TEN different users – each user checking his own individual site.

Does anyone know of such a plugin?

Many thanks for any tip in advance!