基于亚稳态的QDI逻辑随机路径切换方法研究

The Research on QDI Random Path Swapping Based on the Metastability

基于QDI异步逻辑与四相双轨协议相结合时数据路径平衡的特性,能够实现双轨编码输入点的随机切换,从而达到各数据路径的平均功耗平衡,消除数据与功耗之间关联的目的.然而,现有的利用多路复用器实现数据路径随机切换的方法存在抗攻击弱点,削弱了系统的抗能量分析攻击能力.为此,我们提出了基于亚稳态的QDI随机路径切换方法:采用两级切换结构,利用亚稳态发生器和亚稳态滤波器,实现数据路径组和数据路径的随机切换.仿真结果表明,基于亚稳态的QDI随机路径切换方法具有良好的功耗平衡特性,能够很好的抵消由于寄生电容和负载电容差异造成的旁路信息泄露,从而极大地提高系统的安全性.

Based on the balance characteristic of the data-path when combining QDI asynchronous logic and the four-phase protocol with dual-rail encoding, the random swapping of the data-path rail can be implemented, so the balance of the average power for every data-path can be implemented, and the correlation between the data and the power can also be eliminated.But because of using the multiplexer for the random swapping,the current method will induce the system＇ s ability of against power analysis attack to be weakened. So the method of QDI random data-path swapping, which is based on the metastability is put forward. By adopting the two-level swapping structure, the metastability generator and metastability filter, the random swapping between the data-path group and the data-path can be implemented. Simulation results show that, the method has the characteristic of preferable power bal- ance, and the leakage of the side-channel information brought by the differences of the parasitic capacitor and the load capacitor, can also be counteracted.