一种抗旁路攻击的自愈密码系统设计*

旁路攻击是一种非破坏性的物理攻击方法，针对密码芯片存在旁路泄露的安全隐患，提出一种具有自愈特性的密码系统设计方法。首先，该方法通过在密码算法运算中插入测量失效点，使攻击者无法获取统计分析所必需的泄露信息；在此基础上，采用对掩码的定时更新技术使得泄露信息失效，从而重建系统的安全性。与已有的防御方法相比，即使部分泄露信息被攻击者获取时，该方法仍具有强壮的自愈能力和抗旁路攻击能力。

Method on building self healing cryptosystem resistant to side channel attack

Side-channel attack is a new non invasive cryptanalysis. As for the security risk induced by side channel attack, firstly, this paper proposed a new masking method, and restricted the side channel measurement by inserting some measure disabled points into the cryptographic algorithm. And then, applied a masking update technique for making the side channel leakage invalid. Compared with previous countermeasures, this method has stronger ability of self healing and it also resists to complex side channel attack.