Password Generators – a slight variant on

Clearly there are hundreds of these things, but so far as i can establish they all require that a user registers in the wordpress site. I don’t really want to put the user through a registeration process (suspect it will deter more people than it attracts). What i want to do instead is send them a link by URL to a password protected page within the site, along with the password that unlocks that page in a single communication. What would be really nice is if the plug in were able to generate a slightly different password with each transmission, and restrict it to say 2 or 3 uses before it locks it. Ideally a pretty simple password that can be remembered if necessary as i suspect most people will be doing this on their phone. Does anyone know of a plug in that can perform this please?