Methods and systems for processing multiple levels of data in system security approaches are disclosed. In one embodiment, a first set and a second set of resources are selected to iteratively and independently reverse multiple levels of format conversions on the payload portions of a data unit from a first file and a data unit from a second file, respectively. The first file and the second file are associated with a first transport connection and a second transport connection, respectively. Upon completion of the aforementioned reversal operations, the payload portions of a first reversed data unit and a second reversed data unit, which correspond to the data unit of the first file and the data unit of the second file, respectively, are inspected for suspicious patterns prior to any aggregation of the data units of the first file or the second file.