Security Code (Score 0)

I don't understand why they don't replace the 3 digit secuity code with a matrix on the back of the physical card, and when asked for CC details you are asked to provide the numbers/letters at given points in the matrix (e.g. Please enter security codes A3, B9 and T7), which can then be verified by the bank. Sure, it's not completely secure, but it's a hell of a lot more secure than 3 fixed numbers. I guess the banks would consider this as too complicated for ma and pa Bloggs, but surely they could offer it as a choice for people who shop online a lot.