## Automorphisms over a Ring

Hi all,
Consider n = p*q, both p and q being primes.
Also, consider f(x) to be a 3rd degree polynomial which might be irreducible itself, or migh be breakable into irreducible factors over Z_n[X].

How do we find ALL automorphisms of Z_n[X]/(f(X)) for all possible cases of f(x).