Some embodiments of the present invention provide a method for modifying computer-executable instructions. In various embodiments, the method includes applying, with a processor, a data transformation to one or more value representations in the computer-executable instructions to create one or more transformed code segments; dividing the one or more transformed code segments into portions, the portions including a first portion and a second portion, the first portion including instructions for providing a first set of data for use by the second portion; altering the first portion of instructions so that it includes instructions for encrypting the first set of data; and storing the first portion of instructions with corresponding computer executable instructions on non-transient storage media.