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 side channel attack profiles, can be given and analyzed a model against side channel attacks that algorithm.