yeah only the old one is unsafe, and you should send asap your fund on the new address, which is bound to a new private key, which should be safe
but usually if you're private key was stolen, you have not the time to do this thing
I would like to use new address, and I will, but I get regular small payments on old address. There is a way how to generate new private key and still keep that old address? I dont wanna loose it. I see blockhain.info have '''sweep key''' what its mean?
My old private key know one trusted bitcointalk member, so im not worry too much but who knows?
Ok Im happy that my all other btc is save and I can lost only what is on old address and its not much.
Thanks