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In a high performance network security co-processor, the low power masking technique is used to promote the power attack resistant level of the AES crypto engine. Based on the original AES module which shares one S-box when ciphering and decoding, in order to achieve higher security, the novel circuit design of masking is achieved by two ways respectively, one utilized SRAM, the other replicated some modules. Over 1000 different power curves are recorded and compared between the two masked engines and the original one respectively, and over 10000 curves are recorded to show the strength of the masking architecture. The design is verified to be feasible by FPGA.