针对车载自组织网络(Vehicular Ad Hoc Network,VANET)中的隐私保护问题,提出一种基于SM9算法的聚合签名方案。该方案以SM9签名算法为基础,结合聚合签名技术提高认证效率,利用雾计算降低时延,实现对数据的实时处理需求,同时满足条件隐...针对车载自组织网络(Vehicular Ad Hoc Network,VANET)中的隐私保护问题,提出一种基于SM9算法的聚合签名方案。该方案以SM9签名算法为基础,结合聚合签名技术提高认证效率,利用雾计算降低时延,实现对数据的实时处理需求,同时满足条件隐私保护、匿名性和不可链接性等安全需求。最后,通过假名机制保护车辆隐私,确保当车辆发生非法行为时能够快速追踪其真实身份。在随机谕言机模型下,证明了该方案的不可伪造性。性能分析结果表明,与现有方案相比,所提方案有效降低了聚合验证阶段的计算开销,适用于资源受限的车联网环境。展开更多
In this study,Mg-Gd-Y-(Sm)-Zr(GW-(Sm))alloys were subjected to compression tests at both 293 and 77 K.The effect of Sm addition on the plastic deformation mechanism of Mg-Gd-Y-Zr(GW)alloy was investigated,and a detail...In this study,Mg-Gd-Y-(Sm)-Zr(GW-(Sm))alloys were subjected to compression tests at both 293 and 77 K.The effect of Sm addition on the plastic deformation mechanism of Mg-Gd-Y-Zr(GW)alloy was investigated,and a detailed analysis was conducted on the relationships between mechanical responses and the microstructure of the alloys.The findings suggest that dislocation slip plays a predominant role in the plastic deformation of GW-(Sm)alloys.The addition of Sm reduces the stacking fault energy(SFE)of the alloy,which promotes<c+a>slip and inhibits twinning.Meanwhile,Sm plays a role in solution strengthening,causing an elevation in the flow stress of the alloy.At cryogenic temperature(CT),the critical resolved shear stress(CRSS)of dislocation slip is increased,so the dislocation motion requires greater external force.In addition,the extensive crossed twins exhibited in the microstructure,which shorten the dislocation slip path and enhance the grain boundary strengthening.This research contributes to the advancement of plastic deformation theories for magnesium-rare earth(Mg-RE)alloys.展开更多
文摘针对车载自组织网络(Vehicular Ad Hoc Network,VANET)中的隐私保护问题,提出一种基于SM9算法的聚合签名方案。该方案以SM9签名算法为基础,结合聚合签名技术提高认证效率,利用雾计算降低时延,实现对数据的实时处理需求,同时满足条件隐私保护、匿名性和不可链接性等安全需求。最后,通过假名机制保护车辆隐私,确保当车辆发生非法行为时能够快速追踪其真实身份。在随机谕言机模型下,证明了该方案的不可伪造性。性能分析结果表明,与现有方案相比,所提方案有效降低了聚合验证阶段的计算开销,适用于资源受限的车联网环境。
基金supported by the National Natural Science Foundation of China(Nos.52275322 and 51875127).
文摘In this study,Mg-Gd-Y-(Sm)-Zr(GW-(Sm))alloys were subjected to compression tests at both 293 and 77 K.The effect of Sm addition on the plastic deformation mechanism of Mg-Gd-Y-Zr(GW)alloy was investigated,and a detailed analysis was conducted on the relationships between mechanical responses and the microstructure of the alloys.The findings suggest that dislocation slip plays a predominant role in the plastic deformation of GW-(Sm)alloys.The addition of Sm reduces the stacking fault energy(SFE)of the alloy,which promotes<c+a>slip and inhibits twinning.Meanwhile,Sm plays a role in solution strengthening,causing an elevation in the flow stress of the alloy.At cryogenic temperature(CT),the critical resolved shear stress(CRSS)of dislocation slip is increased,so the dislocation motion requires greater external force.In addition,the extensive crossed twins exhibited in the microstructure,which shorten the dislocation slip path and enhance the grain boundary strengthening.This research contributes to the advancement of plastic deformation theories for magnesium-rare earth(Mg-RE)alloys.
