Research On Circuit Logic And Structure Of Anti - Bypass Attack

With the increasing demand for high secure information, Security integrated circuits (IC) which applies to smart cards, e-commence, electronic bank and so on, is becoming more and more important nowadays. Recent years, the side-channel attacks put great threats on security systems. These side-channel attack methods include fault analysis attack, power analysis attack, and electromagnetic analysis attack, etc. The differential power analysis attack is especially harmful to Security IC.In this paper, after briefly introducing the basic theory of the Sense Amplifier Based Logic (SABL), a full-custom design of AES SubByte module based on pipeline structure SABL is proposed. This design is implemented using SMIC 0.18um CMOS technology. Simulation results show that it can work at the frequency of 83.3MHz, and its total area is about 0.85mm~2.Power consumption of this design is independent of both value and sequence of data. Therefore this design is resistant to power analysis attack.After that, based on the fundamentals of side-channel attacks, a new logic style Differential inputs Differential outputs Clocked cascode Voltage Switch Logic (DDCVSL) is presented, which is proposed to lower power and area cost of security IC’s against Differential Power Analysis (DPA) attack. In order to evaluate implementation of DDCVSL, a full-custom design of AES SubByte module based on DDCVSL is proposed. Experimental results show that the use of the new logic saves 16.4% in power consumption and 15.2% in cost compared with SABL.Besides, a mix design of digital and full-custom design on AES system has been proposed in this paper. The proposal achieves against DPA attack.Finally, several proposals concerning future study on countermeasures of logic style and structure against side-channel attacks have been suggested.