arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.03873cs.CR
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远程认证中的TOCTOU问题

On the TOCTOU Problem in Remote Attestation

Ivan De Oliveira Nunes, Sashidhar Jakkamsetti, Norrathep Rattanavipanon, Gene Tsudik

摘要:

我们提出了远程证明与TOCTALIAN避免(RATA):一个可证明安全的方法来解决RA TOCTALIAN问题。使用RATA,即使是在执行下一个RA之前擦除自己的恶意软件,也无法隐藏其短暂的存在。RATA的目标是混合RA架构(实现为硬件/软件协同设计),其目标是低端嵌入式设备。我们提出了两种替代技术- RATAa和RATAb -适用于设备和没有实时时钟,分别。每个都被证明是安全的,并伴随着一个公开的和正式验证的实现。我们的评估表明这两种技术的硬件开销低。与当前的RA架构(不提供TOCT保护)相比,RATA不会产生额外的运行时开销。事实上,RATA大大降低了RA执行的计算成本。

英文摘要:

We propose Remote Attestation with TOCTOU Avoidance (RATA): a provably secure approach to address the RA TOCTOU problem. With RATA, even malware that erases itself before execution of the next RA, can not hide its ephemeral presence. RATA targets hybrid RA architectures (implemented as Hardware/Software co-designs), which are aimed at low-end embedded devices. We present two alternative techniques - RATAa and RATAb - suitable for devices with and without real-time clocks, respectively. Each is shown to be secure and accompanied by a publicly available and formally verified implementation. Our evaluation demonstrates low hardware overhead of both techniques. Compared with current RA architectures - that offer no TOCTOU protection - RATA incurs no extra runtime overhead. In fact, RATA substantially reduces computational costs of RA execution.

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