password distribution mechanism sought

[Russell Taylor Comp 238 f86]

          QUESTION:  
        I would like to locate a utility
        that would allow users to change their password on one machine
        (in this case a VAX 6310 running ULTRIX),
        and have that change automatically propagated to all the other
        department
        machines on which they have accounts.  Optimally, this utility
        would distribute the encoded password so that our programs
        that search for easy-to-break passwords would only have to work
        on one encryption for each user.

        Our department has a large number and variety of UNIX machines, 
        including
        suns, VAXes, and a Data General.  All but the DG run some version
        of BSD UNIX (ULTRIX, 4.3 Mt. Xinu, SUN/OS), and the DG runs DG/UX,
        a System V/4.2 combination.  The suns have a common user community, 
        but each of the other machines has a separate set of users and 
        therefore a separate password file.
         
        While we have the ability to use the yellow pages, the different
        users on each machine make this undesirable.
         
        I would like to hear from anyone who has installed such a system.
        Thanks in advance.