In order to achieve the purpose of defending against side channel attacks, a compact SM4 circuit was designed based on the mask and random delay technique, and the linear transformation module was designed with random insertion of the pseudo operation method. By analyzing the glitch data generated by the S-box of SM4 with different inputs, the security against glitch attacks was confirmed. Then, the DPA (Differential Power Analysis) was performed on the designed circuit. The key could not be successfully obtained even in the case of 100,000 power curves, so that the safety of SM4 against DPA is verified. Finally, using Synopsys DC (Design Compiler, Mountain View, CA94043DC, USA) to synthesize the designed circuit, the results show that the area of the designed circuit in the SMIC 0.18 process is 82,734 μm2, which is 48% smaller than results reported in other papers.
Abstract. To analysis of contact interaction between barrel and projectile, its finite element calculation formulas were deduced on the base of contact theory. By using the new method and finite element model, the contact interaction between barrel and projectile of a rifle was calculated. The calculation results show that the barrel and projectile were plastic deformation, especially the equivalent stress of projectile has been in strength limit region, and this is the main reason for embed copper during firing. So, the structure of barrel rifling and projectile should be optimized. The optimization process can be guided by the new method, and a computing platform for the process was provided by the established model.
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