I need a plugin – Page Password Secure

Hallo wordpressers,
I want a plugin, which can generate a password for an user to get to a pege in my site that i’ve secured. That plugin have to generate a different passwords for each user and to be used just from 1 IP adress. Does that kind of plugin exist? I really need one now!
I generalize: A plugin, which secures a page on my site and the only way for an user to reach that password is to ask me, but that password, that has been generated, have to be used just once from the user, who I gave tha password to. Please, answer quickly ??
Thanks a lot !

[moved to: ‘Plugin and Hacks’]