"I'm sorry, my current contract forbids me from discussing my remuneration. I'm sure you understand and have similar policies. However, I can give you a ballpar

"I'm sorry, my current contract forbids me from discussing my remuneration. I'm sure you understand and have similar policies. However, I can give you a ballpark figure: more than <insert your desired base salary here>." Or you could just be honest and tell them what you're currently earning. They still have to make you an offer, and you're free to reject it. I don't think telling potential employers your current salary is losing 'the hand', or if it is, you have plenty of opportunity during the negotiation of your offer to get it back. But really, if your potential employer has a simple go/no-go flag on some salary threshold, then you can be sure you don't want to work there--especially because your co-workers there have (like yourself) won a race to the bottom.