Design of feedback shift register of against power analysis attack

For simple hardware structure, high speed encryption and lower power consuming, stream ciphers well suited for constrained environments, such as satellite communications, RFID tag, sensor networks and IoT. Linear feedback shift register (LFSR) is widely used in the design of stream cipher to improve the periodic property of key stream. Since the switching of the status bits is regular, the power consumption of the LFSR is highly correlated in a linear way. The power consumption characteris-tics of stream cipher based on LFSR are vulnerable to leaking initialization vectors (IV) under the power attacks. Basing on the power model of LFSR, a new design of LFSR against power attacks is proposed in this paper. In this countermeasure, the power consumption characteristics of LFSR can be masked by using an additional LFSR and a new filter Boolean function. Compared with the others designs, this de-sign can confused the power consumption trace and can be more easily implemented by circuits.