Aimed at the problem that integrated circuits (ICs) may be attacked by hardware Trojan during the process of design or fabrication

thereby posing a significant risk in terms of their trusted field operation

it introduces the basic principles and taxonomy of hardware Trojan

and proposes the design of a kind of hardware Trojan

based on electromagnetic leakage. The Trojan circuit can reveal the encryption key of cipher IC by using electromagnetic emission. Based on FPGA(Field Programmable Gate Array) chips

an automatic cipher circuit test platform of AES (Advanced Encryption Standard) was constructed. By the analysis of the side channel

the hardware Trojan circuit could be detected. The experimental results show that the hardware Trojan can secretly steal the 128 bit AES encryption key

and that the detection me

thod can help to identify this type of Trojan in AES cipher circuit

achieving the detection rate of 10

-2

.