访问驱动下的Cache侧信道攻击研究综述

近年来，海量异构的物联网终端设备承载着核心功能，更易成为攻击者的直接目标.Cache侧信道攻击越来越多地出现在终端设备和云平台中，该攻击通过构建细粒度、高隐蔽性的Cache侧信道从目标设备中提取加密密钥等敏感数据，打破设备的隔离保护机制.在综述中，针对访问驱动下的Cache侧信道攻击技术展开研究，介绍了Cache侧信道攻击技术的基本原理和研究现状，通过理论分析和实例验证的方式重点研究了“清除+重载”攻击、“填充+探测”攻击、“刷新+重载”攻击的攻击原理、攻击过程和攻击效果.以攻击特点、攻击范围和对应的防御方案为切入点，对上述3种攻击进行对比分析，指出不同攻击的优缺点和适用场景；进一步探讨攻击过程中存在的问题，提出了攻击最后一级缓存(last-level cache, LLC)和噪声处理方面面临的挑战.最后结合万物互联时代下，从Cache层次结构的逐步转变、云平台的海量数据存储、以及终端设备上可信应用环境的广泛部署等现状，讨论了未来可能的研究方向.

Survey of Access-Driven Cache-Based Side Channel Attack

In recent years, massive heterogeneous IoT (Internet of things) terminal devices carry the core functions, and they are easier to be the direct targets of attackers. Besides, more terminal devices and cloud platforms are suffering from cache-based side channel attacks. These attacks construct the fine-grained and the concealed cache side channel to extract sensitive data (such as encryption keys) from the target devices, which defeats the isolation mechanism. In this paper, we focus on access-driven cache-based side channel attack technology. Firstly, the fundamental principle and the current research status of cache-based side channel attack are present. Then,