加密算法被广泛用来保护秘密信息,侧信道攻击通过捕获侧信道数据对加密算法进行攻击。相关功耗分析(Correlation Power Analysis,CPA)攻击具有易于捕获功耗数据、算法实现简单、攻击效率高等特点,是加密算法的重要威胁之一。掩码技术是...加密算法被广泛用来保护秘密信息,侧信道攻击通过捕获侧信道数据对加密算法进行攻击。相关功耗分析(Correlation Power Analysis,CPA)攻击具有易于捕获功耗数据、算法实现简单、攻击效率高等特点,是加密算法的重要威胁之一。掩码技术是一种常用于防御功耗分析攻击的技术,这种技术在不修改算法本身功耗特点的情况下,引入随机数。掩码使算法中间值随机化,降低算法中间值与功耗数据的相关性,能够防御相关功耗分析攻击等。对有限域(Galois Field,GF)实现的高级加密标准(Advanced Encryption Standard,AES)算法、SM4算法使用掩码技术进行防护,重点在于优化有限域求逆算法。针对AES算法、SM4算法分别提出一种有限域掩码算法,使用全掩码技术,其中包含一种通用的有限域求逆算法。该GF(28)上求逆算法共使用6个GF(24)乘法模块,2个GF(24)平方模块,2个GF(24)平方后乘常数模块和1个GF(24)求逆模块,求逆结果输出基本同步。实验结果表明,掩码算法有效提升了算法硬件实现的抗功耗攻击能力。展开更多
We improved the adhesion between silicon based insulating materials and epoxy resin composites by adding the adhesion promoter cycloborosiloxane(BSi,cyclo-1,3,3,5,7,7-hexaphenyl-1,5-diboro-3,7-disiloxane).The experime...We improved the adhesion between silicon based insulating materials and epoxy resin composites by adding the adhesion promoter cycloborosiloxane(BSi,cyclo-1,3,3,5,7,7-hexaphenyl-1,5-diboro-3,7-disiloxane).The experimental results show that the addition of BSi in the silicone rubber(SR)system significantly increases the tensile shear strength between BSi and epoxy resin(EP),reaching 309%of the original value.On this basis,the mechanism of BSi to enhance the adhesion effect was discussed.The electron deficient B in BSi attracted the electron rich N and O in EP to enhance the chemical interaction,combined with the interfacial migration behavior in the curing process,to improve the adhesion strength.This study provides the design and synthesis ideas of adhesive aids,and a reference for further exploring the interface mechanism of epoxy resin matrix composites.展开更多
Natural rubber/styrene-butadiene-styrene(NR/SBS)membrane was prepared by solution blend,and then used for recovery of butanol from its dilute solution by pervaporation(PV).The thermodynamic and mechanical properties o...Natural rubber/styrene-butadiene-styrene(NR/SBS)membrane was prepared by solution blend,and then used for recovery of butanol from its dilute solution by pervaporation(PV).The thermodynamic and mechanical properties of NR/SBS blend membrane were characterized by TGA and tensile test,respectively.A layer of relatively dense blend membrane with the thickness of about 37μm was closely cast on a layer of porous polyvinylidene difluoride(PVDF)support.And there was no obvious phase separation observed between the interface of two layers.Both flux and separation factor increased with increasing feed temperature.Butanol flux increased as feed concentration increased consistently.The blend membrane which got the best performance obtained membrane separation factor of 28.8 with total flux of 2695.2 g/m^(2)h at 70℃ when feed concentration was 4.00wt%.展开更多
基金the Core Research Facilities of College of Chemistry and Molecular Sciences and Wuhan University Test Center and Open Fund of Hubei Key Laboratory of Aerospace Power Advanced Technologythe Open Fund of Hubei Key Laboratory of Aerospace Power Advanced Technologythe Special Fund for Industrial and informatization Industry Foundation Reconstruction and High Quality Development of Manufacturing Industry(No.TC220H068)。
文摘We improved the adhesion between silicon based insulating materials and epoxy resin composites by adding the adhesion promoter cycloborosiloxane(BSi,cyclo-1,3,3,5,7,7-hexaphenyl-1,5-diboro-3,7-disiloxane).The experimental results show that the addition of BSi in the silicone rubber(SR)system significantly increases the tensile shear strength between BSi and epoxy resin(EP),reaching 309%of the original value.On this basis,the mechanism of BSi to enhance the adhesion effect was discussed.The electron deficient B in BSi attracted the electron rich N and O in EP to enhance the chemical interaction,combined with the interfacial migration behavior in the curing process,to improve the adhesion strength.This study provides the design and synthesis ideas of adhesive aids,and a reference for further exploring the interface mechanism of epoxy resin matrix composites.
基金Funded by the Fundamental Research Funds for the Central Universities(No.2042021kf1044)。
文摘Natural rubber/styrene-butadiene-styrene(NR/SBS)membrane was prepared by solution blend,and then used for recovery of butanol from its dilute solution by pervaporation(PV).The thermodynamic and mechanical properties of NR/SBS blend membrane were characterized by TGA and tensile test,respectively.A layer of relatively dense blend membrane with the thickness of about 37μm was closely cast on a layer of porous polyvinylidene difluoride(PVDF)support.And there was no obvious phase separation observed between the interface of two layers.Both flux and separation factor increased with increasing feed temperature.Butanol flux increased as feed concentration increased consistently.The blend membrane which got the best performance obtained membrane separation factor of 28.8 with total flux of 2695.2 g/m^(2)h at 70℃ when feed concentration was 4.00wt%.
