Efficient and Round-Optimal Oblivious Transfer and Commitment with Adaptive Security

Efficient and Round-Optimal Oblivious Transfer and Commitment with Adaptive Security
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具有自适应安全性的高效且轮次最优的不经意转移和承诺

DOI:
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发表时间:
2020
期刊:
IACR Cryptology ePrint Archive
影响因子:
--
通讯作者:
X. Wang
X. Wang
中科院分区:
--
文献类型:
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作者:
R. Canetti;Pratik Sarkar;X. Wang

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在公共随机串( ext {CRS}))模型。该方案在DDH假设下是UC安全的。它引起(mathcal {O}(1))求幂并发送(mathcal {O}(1))组元素,而现有技术需要(mathcal {O}(kappa ^2))求幂并传送( ext {poly}(kappa))比特,其中(kappa)是计算安全参数。沿着这条路,我们在DDH下得到了其他几个有效的UC安全OT协议: 最有效的两轮自适应字符串OT协议假设全球可编程随机预言。此外,假设发送方的输入是随机的,在同时消息设置中,可以使协议是非交互式的。 第一个两轮的字符串-OT与摊销常数指数和通信开销,这是安全的,在全球可观察的随机预言模型。 2016年10月12日,第一张专辑《The Two Round》( ext {CRS})模型,该模型会产生恒定的计算和通信开销。
We construct the most efficient two-round adaptively secure bit-OT in the Common Random String (( ext {CRS} )) model. The scheme is UC secure under the Decisional Diffie-Hellman (DDH) assumption. It incurs (mathcal {O}(1)) exponentiations and sends (mathcal {O}(1)) group elements, whereas the state of the art requires (mathcal {O}(kappa ^2)) exponentiations and communicates ( ext {poly}(kappa )) bits, where (kappa ) is the computational security parameter. Along the way, we obtain several other efficient UC-secure OT protocols under DDH: The most efficient yet two-round adaptive string-OT protocol assuming global programmable random oracle. Furthermore, the protocol can be made non-interactive in the simultaneous message setting, assuming random inputs for the sender. The first two-round string-OT with amortized constant exponentiations and communication overhead which is secure in the global observable random oracle model. The first two-round receiver equivocal string-OT in the ( ext {CRS} ) model that incurs constant computation and communication overhead.
DOI: 10.1007/978-3-319-78375-8_17
发表时间: 2018-04
期刊: IACR Cryptol. ePrint Arch.
影响因子: --
作者:
Fabrice Benhamouda;Huijia Lin
通讯作者: Fabrice Benhamouda;Huijia Lin