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arXiv 2402.02358cs.ITmath.IT
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通过指数和修复素数域上的 Reed-Solomon 码

Repairing Reed-Solomon Codes over Prime Fields via Exponential Sums

Roni Con, Noah Shutty, Itzhak Tamo, Mary Wootters

AI总结:

本文提出两种素数域上低码率 Reed-Solomon 码的修复方案,通过指数和的新联系实现恒定比特下载修复,并首次证明小 k 的 Shamir 秘密共享不具有泄漏弹性。

摘要:

本文提出了两种针对素数域上低码率 Reed-Solomon (RS) 码的修复方案,这些方案能够通过从每个幸存节点下载恒定数量的比特来修复任意节点。这些方案产生的总带宽大于平凡修复所产生的带宽;然而,这在泄漏弹性秘密共享的背景下尤其相关。在该框架中,我们的结果提供了攻击,表明对于较小的 k,素数域上的 k-out-of-n Shamir 秘密共享不具有泄漏弹性,即使各方仅泄漏恒定数量的比特。据我们所知,这是首次此类攻击。我们的结果源于指数和与 RS 码修复之间的一种新颖联系。具体来说,我们证明了某些指数和的非平凡界意味着素数域上 RS 码的显式非线性修复方案的存在。

英文摘要:

This paper presents two repair schemes for low-rate Reed-Solomon (RS) codes over prime fields that can repair any node by downloading a constant number of bits from each surviving node. The total bandwidth resulting from these schemes is greater than that incurred during trivial repair; however, this is particularly relevant in the context of leakage-resilient secret sharing. In that framework, our results provide attacks showing that $k$-out-of-$n$ Shamir's Secret Sharing over prime fields for small $k$ is not leakage-resilient, even when the parties leak only a constant number of bits. To the best of our knowledge, these are the first such attacks. Our results are derived from a novel connection between exponential sums and the repair of RS codes. Specifically, we establish that non-trivial bounds on certain exponential sums imply the existence of explicit nonlinear repair schemes for RS codes over prime fields.

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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