Page Users with Passwords

Would anyone know what I can use in wordpress to individually assign user names and passwords per page.

For example consider these pages: http://www.website.com/john http://www.website.com/jane

username: john with password john123 to access http://www.website.com/john
username: jane with password jane123 to access http://www.website.com/jane

Also, allow john or jane to change content on their own respective page.

Plus, have a secondary password to allow selective individuals to visit john’s page for viewing.

Can anyone point me in the right direction … to an existing theme or plugin? Keep in mind, I’m new to wordpress, so coding is not really an option.

Thank you kindly,
IceWanda