arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.06327cs.CR
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让云监控您的IoT文件系统

Let the Cloud Watch Over Your IoT File Systems

Liwei Guo, Yiying Zhang, Felix Xiaozhu Lin

摘要:

智能设备生成安全敏感数据,并将其保存在设备上的存储中以实现持久性。然而,目前智能设备上的存储堆栈提供了薄弱的安全保障:不仅因为堆栈依赖于易受攻击的商品操作系统,而且还因为智能设备部署在安全措施方面已知较弱。为了在智能设备上保护这样的数据,我们提出了一种新颖的存储堆栈架构,其i)在可信执行环境(TEE)中保护文件数据; ii)将文件系统逻辑和元数据外包到TEE之外; iii)在云中运行仅元数据的文件系统副本,用于连续地验证设备上的文件系统行为。为了实现该架构,我们构建了基于TrustZone的存储堆栈Overwatch。Overwatch解决了独特的挑战,包括细粒度识别元数据,隐藏网络延迟,以及应对云断开。在一套三个真实世界的应用程序中,Overwatch显示出适度的安全开销。

英文摘要:

Smart devices produce security-sensitive data and keep them in on-device storage for persistence. The current storage stack on smart devices, however, offers weak security guarantees: not only because the stack depends on a vulnerable commodity OS, but also because smart device deployment is known weak on security measures. To safeguard such data on smart devices, we present a novel storage stack architecture that i) protects file data in a trusted execution environment (TEE); ii) outsources file system logic and metadata out of TEE; iii) running a metadata-only file system replica in the cloud for continuously verifying the on-device file system behaviors. To realize the architecture, we build Overwatch, aTrustZone-based storage stack. Overwatch addresses unique challenges including discerning metadata at fine grains, hiding network delays, and coping with cloud disconnection. On a suite of three real-world applications, Overwatch shows moderate security overheads.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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