An attacker supplies the target software with input data that contains
						sequences of special characters designed to bypass input validation logic.
						This exploit relies on the target making multiples passes over the input
						data and processing a "layer" of special characters with each pass. In this
						manner, the attacker can disguise input that would otherwise be rejected as
						invalid by concealing it with layers of special/escape characters that are
						stripped off by subsequent processing steps.