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arXiv 1701.03023cs.ITmath.IT
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关于安全精确修复再生码的折衷域

On the Tradeoff Region of Secure Exact-Repair Regenerating Codes

Shuo Shao, Tie Liu, Chao Tian, Cong Shen

摘要:

我们认为$(n,k,d,\ell)$安全的精确修复再生代码问题,它概括了$(n,k,d)$精确修复再生代码问题的附加约束,存储的文件需要保持信息理论上的安全,对窃听者,谁可以访问传输的数据,以再生一个总的$\ell$不同的失败节点。对于这个问题的所有已知结果,归一化存储容量和修复带宽之间的可实现的折衷区域具有单个角点,由Shah,Rashmi和Kumar提出的方案(SRK点)实现。由于没有任何保密约束的精确修复再生代码问题的可实现折衷区域通常具有多个角点,因此这些现有结果表明类似相变的行为,即,强制保密约束($\ell\geq 1$)立即将折衷区域减少到具有单个角点的区域。在这项工作中,我们首先表明,当保密参数$\ell$是足够大的,SRK点确实是唯一的角点的权衡区域。然而,当$\ell$是小的,我们表明,权衡区实际上可以有多个角点。特别是,我们建立了一个精确的表征的权衡区域的$(7,6,6,1)$问题,它正好有两个角点。因此,随着保密约束的逐渐加强,应该期望平滑的过渡,而不是相变类型的过渡。

英文摘要:

We consider the $(n,k,d,\ell)$ secure exact-repair regenerating code problem, which generalizes the $(n,k,d)$ exact-repair regenerating code problem with the additional constraint that the stored file needs to be kept information-theoretically secure against an eavesdropper, who can access the data transmitted to regenerate a total of $\ell$ different failed nodes. For all known results on this problem, the achievable tradeoff regions between the normalized storage capacity and repair bandwidth have a single corner point, achieved by a scheme proposed by Shah, Rashmi and Kumar (the SRK point). Since the achievable tradeoff regions of the exact-repair regenerating code problem without any secrecy constraints are known to have multiple corner points in general, these existing results suggest a phase-change-like behavior, i.e., enforcing a secrecy constraint ($\ell\geq 1$) immediately reduces the tradeoff region to one with a single corner point. In this work, we first show that when the secrecy parameter $\ell$ is sufficiently large, the SRK point is indeed the only corner point of the tradeoff region. However, when $\ell$ is small, we show that the tradeoff region can in fact have multiple corner points. In particular, we establish a precise characterization of the tradeoff region for the $(7,6,6,1)$ problem, which has exactly two corner points. Thus, a smooth transition, instead of a phase-change-type of transition, should be expected as the secrecy constraint is gradually strengthened.

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