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arXiv 2402.08407cs.CR
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面向非均匀信息的基于编码的混合后量子密码系统

Coding-Based Hybrid Post-Quantum Cryptosystem for Non-Uniform Information

Saar Tarnopolsky, Alejandro Cohen

AI总结:

针对非均匀消息,本文提出一种在有限块长机制下提供后量子安全性的混合通用网络编码密码系统NU-HUNCC,通过次线性共享种子实现高效压缩,并证明其具备个体安全性、ISS-CCA1安全性与高通信速率。

摘要:

针对非均匀消息,我们在有限块长机制下引入了一种新型混合通用网络编码密码系统(NU-HUNCC),该系统在高通信速率下提供后量子(PQ)安全性。最近,混合密码系统通过使用安全编码方案对数据进行预混合并仅加密其中一小部分来提供PQ安全性,其假设数据是均匀分布的。这一假设通常难以强制执行。标准的定长无损源编码和压缩方案在归一化散度中保证均匀输出。然而,这不足以保证安全性。我们为所提出的混合密码系统考虑了一种在非归一化变分距离下的高效几乎均匀压缩方案,该方案通过利用均匀的次线性共享种子来保证PQ安全性。具体而言,对于所提出的PQ密码系统,首先,我们为非均匀消息提供了一种端到端编码方案NU-HUNCC。其次,我们证明NU-HUNCC针对能够访问任意链路子集的窃听者具有信息论上的个体安全性(IS)。第三,我们引入了修改后的安全定义,即在选定密文攻击下的个体语义安全(ISS-CCA1),并证明针对全观察窃听者,NU-HUNCC满足其条件。最后,我们提供的分析表明NU-HUNCC具有高通信速率且共享种子大小可忽略不计。

英文摘要:

We introduce for non-uniform messages a novel hybrid universal network coding cryptosystem (NU-HUNCC) in the finite blocklength regime that provides Post-Quantum (PQ) security at high communication rates. Recently, hybrid cryptosystems offered PQ security by premixing the data using secure coding schemes and encrypting only a small portion of it, assuming the data is uniformly distributed. An assumption that is often challenging to enforce. Standard fixed-length lossless source coding and compression schemes guarantee a uniform output in normalized divergence. Yet, his is not sufficient to guarantee security. We consider an efficient almost uniform compression scheme in non-normalized variational distance for the proposed hybrid cryptosystem, that by utilizing uniform sub-linear shared seed, guarantees PQ security. Specifically, for the proposed PQ cryptosystem, first, we provide an end-to-end coding scheme, NU-HUNCC, for non-uniform messages. Second, we show that NU-HUNCC is information-theoretic individually secured (IS) against an eavesdropper with access to any subset of the links. Third, we introduce a modified security definition, individually semantically secure under a chosen ciphertext attack (ISS-CCA1), and show that against an all-observing eavesdropper, NU-HUNCC satisfies its conditions. Finally, we provide an analysis that shows the high communication rate of NU-HUNCC and the negligibility of the shared seed size.

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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