基于虚拟孔与双轨预充电技术的电流型混淆逻辑电路设计

功耗攻击是密码芯片面临的一种极具威胁性的攻击方式，而逆向攻击将有助于提高功耗攻击的效率和成功率。为提升密码芯片中逻辑电路的安全性，通过将虚拟孔技术应用于电流型CMOS电路，设计了具有相同电路结构的与非门、或非门以及非门，使攻击者无法准确分辨电路的逻辑功能，起混淆逻辑作用。在此基础上，结合双轨预充电技术良好的功耗恒定性，使所设计的电路具有抵御功耗和逆向联合攻击的能力。最后用Hspice软件进行了实验验证。     

Temperature Dependence of the Electronic Structure of Ca3Cu2O4Cl2 Mott Insulator

We use scanning tunneling microscopy to study the temperature evolution of electronic structure in Ca₃Cu₂O₄Cl₂ parent Mott insulator of cuprates. It is found that the upper Hubbard band moves towards the Fermi energy with increasing temperature, while the charge transfer band remains basically unchanged. This leads to a reduction of the charge transfer gap size at high temperatures, and the rate of reduction is much faster than that of conventional sem...