Enforce Oracle password to Alpha Numeric

 Hi

I am not certain if I selected the correct community for this question.   I would like to know in Oracle release 11i, can we enforce a Alpha numeric format on user passwords?   Currently, the system accepts..Alpha alone,   Alpha, numeric combined and  Numeric only.   We would like to enforce users to use Alpha numeric only.

Thanks.

Laura 

I discovered there is a profile name : Signon Hard to Guess.  But I only have Yes or No in my LOV.   How can I change it to to read "Password must contain at least one alpha and one numeric.