一种安全高效的 ECC抗功耗攻击方案

功耗攻击由于实现简单、攻击效率高,已经成为当前密码芯片最具威胁的攻击手段之一.为有效解决安全和效率两方面的矛盾,通过将椭圆曲线密码标量进行带符号阶乘展开式编码,并利用折半运算提高标量乘法运算效率,然后结合基点掩码实现抵抗功耗攻击,从而给出一种安全高效的抗功耗攻击椭圆曲线密码方案.算法的安全性及效率分析结果表明:所给抗功耗攻击方案不仅可以抵抗各种功耗攻击,并且与传统抗功耗攻击方案相比,新方案的运算效率提高了24.83％～27.24％,在各类资源受限的应用系统中具有较好的应用价值.

A Security and Efficiency Scheme of Resisting Power Analysis Attacks for ECC

Power analysis attack has become the most threatening for cryptographic chips because of simple operation and high efficiency.In order to effectively solve the contradiction between safety and efficiency,a security and efficiency scheme of resisting power analysis attacks for ellipse curve cryptography is proposed.The scalar is coded by signed factorial expansion forms,and the operation efficiency of scalar multiplication could be improved by using point halving.Meanwhile,the point masking is adopted to resist power analysis attacks.The security and efficiency analysis results show that the proposed scheme could not only resist different power anslysis attacks,but also improve the efficiency about 24.83%~27.24% by comparing with the traditional scheme of resisting power analysis attack.So the proposed scheme has a preferable application value in variety application systems of limited resource.