Codez un logiciel

hi, i want to do a touch software for an estate agency, homepage with a photos and some informations it must have the possibility to change the photo with the tuch, when we put the finger on the photo i want an undermeny interactive with some details about the home. This programm must be a database very dynamisc, this programm have to be very secure, what can you propose for the security? All under unity 3D. thanks for answers