Hidden information is your friend in any negotiation, but especially here, since the hiring folks also know how variable industry salary ranges are. You want to put the first move in their court - decline to give your current salary at all costs, and ideally also avoid offering up your preferred compensation number until they've made a first offer.
The only point where quoting your current salary makes sense is if the company offers less than you are currently making, and you are in such a bad situation at your current where you'd be willing to absorb the pain of changing jobs for no additional money.