Abstract: A switch parser that can not only support software-defined network but also work even with hardware Trojans has been designed. It is composed of reconfigurable process elements of which kernels are lookup tables. The input data are XORed with a random key (Destruction of Cooperation transformation) before being fetched into the parser to destruct the possible argots in the head of packets. The key word match is completed in the approach of transforming the pattern templates at the same time, which avoids appearance of the original data. Synthesized with a 40nm process, the L4 switch parser implemented in this structure achieves up to 220 MHz clock frequency, the area of the PE is about 1760, 000 gates. The test results show that the parser can destruct different types of Trojan trigger conditions.