Car manufacturers aim to enhance the use of two-factor authentication (2FA) to protect keyless entry systems in contemporary cars. Despite providing significant ease for users, keyless entry systems have become more s...Car manufacturers aim to enhance the use of two-factor authentication (2FA) to protect keyless entry systems in contemporary cars. Despite providing significant ease for users, keyless entry systems have become more susceptible to appealing attacks like relay attacks and critical fob hacking. These weaknesses present considerable security threats, resulting in unauthorized entry and car theft. The suggested approach combines a conventional keyless entry feature with an extra security measure. Implementing multi-factor authentication significantly improves the security of systems that allow keyless entry by reducing the likelihood of unauthorized access. Research shows that the benefits of using two-factor authentication, such as a substantial increase in security, far outweigh any minor drawbacks.展开更多
文摘Car manufacturers aim to enhance the use of two-factor authentication (2FA) to protect keyless entry systems in contemporary cars. Despite providing significant ease for users, keyless entry systems have become more susceptible to appealing attacks like relay attacks and critical fob hacking. These weaknesses present considerable security threats, resulting in unauthorized entry and car theft. The suggested approach combines a conventional keyless entry feature with an extra security measure. Implementing multi-factor authentication significantly improves the security of systems that allow keyless entry by reducing the likelihood of unauthorized access. Research shows that the benefits of using two-factor authentication, such as a substantial increase in security, far outweigh any minor drawbacks.
文摘研究设计额定转速为2700 r/min、储能量为60 MJ的合金钢飞轮,以实现石油钻机动力系统飞轮单机MW级输出功率。飞轮材料为35Cr Mo A合金钢,采用"H"形变截面,直径1600 mm,厚380 mm,质量4000 kg。芯轴与轮毂局部过盈配合,采用圆柱销传递飞轮与芯轴之间的扭矩。有限元计算表明,轮辐内厚外薄,实现近似等强度设计;轮缘加厚,调整质量分布,实现大转动惯量;底部圆柱销传递扭矩,局部应力比键连接优化。飞轮轴系具备2.5倍应力安全系数,额定转速下最大应力小于500 MPa。2016年3月飞轮设备调试成功,实现150~200 k W充电、500~1000 k W放电功能,储能密度4.17 W·h/kg,比功率250 W/kg,标志着我国具备了单机WM级飞轮储能设备研制能力。
