旁道攻击是一种针对密码设备的新型攻击技术。本文介绍旁道攻击技术，描述了旁道攻击技术的发展概况，给出和分析了一种可防旁道攻击的模指算法。-Side channel attack is an attack against the password for the new equipment technology. This article describes the technical side channel attack, describes the technology development