Encrypt the hell out of it on the client side with a proprietary encryption routine that you developed with three independant researchers who were unaware of the work each other was doing, then suddenly died after giving their individual pieces of the puzzle, then send it over a private wire that utilizes a special complex exponential encryption routine that cleverly disguises itself as simple standard 128 bit SSL.
The private wire should be a direct one attaching your computer to your database with armed guards every few feet who think the wire is transmitting next years Miss America pageant winners, unless it really IS transmitting the winners in which case you inform the guards you are transmitting the secret formulea for Gerber applesause. It doesn't really matter what you tell the gaurds, you're gonna hafta kill them anyway.
