一种面向SoC的能量迹预处理方法

Differential power attack is one of the most effective methods to reveal the key of cryptographic devices. Therefore, an energy trace classification method based on energy model is proposed to locate the significant points that have strong correlation with the key. Two energy models (hamming distance and hamming weight) are used, and a few sampling points near the significant point are intercepted to form the significant interval. The SoC chip with 128-bit AES algorithm under different keys is attacked. The actual test results show that the length of the optimal characteristic interval obtained by hamming distance energy model is short. Finally, the characteristic point location method based on hamming distance energy model has low sample calculation and reduces a large amount of samples.     

地下室钢筋混凝土无梁底板的设计研究与应用

结合实际工程介绍地下室钢筋混凝土无梁底板的设计方法及底板厚度的估计方法,该法力学概念明确,简单实用,可在实际工程中应用。     

冷弯槽钢压弯屈曲的几点讨论

用理论计算和ansys有限元方法模拟,分别得到压弯槽钢屈曲荷载值,并采用正交分析方法对各个影响因素进行分析,得到各个参数对屈曲值的影响因子。通过理论解和ansys解对比分析得到有效的工程设计结论。