Fast Secure Computation of Set Intersection -解读
2022-05-12 23:17
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本节解读paper:Fast Secure Computation of Set Intersection,
##主要内容 在ROM上基于OMGDH问题设计了一个可以抵抗恶意攻击的PSI,主要贡献是对该协议的安全性分析。 (1)怎么理解"adaptive set intersection"?
(2)"One-More Gap Diffie-Hellman (OMGDH)"假设?
(3)"DDH"问题? 参考:DH问题汇总
(4)"RandomOracle Model",ROM,随机预言机模型? the ROM-based PRF function,基于随机预言机的伪随机函数,f_k(x)=(H(x))^k (5)"Set Intersectionwith Data Transfer"? 就是Labeled-PSI,带标签的PSI。
##介绍 ###安全的集合求交 "Secure computation of set intersection",也就是后面我们说的隐私集合求交,可以用于很多场景中。 而隐私集合求交的扩展协议"Set Intersection with Data Transfer",也就是Labeled-PSI应用也很广泛。
论文写的太奇怪了,$X$和$Y$到底哪个是R的输入?
##假设和工具 ###CDH假设 $g$是$q$阶$G$的生成元,CDH问题是给出$g,ga,gb$,很难计算出$g^$,其中$a,b\in Z_q ^*$是随机整数。
###OMDH
###OMGDH 通常说DDH问题是容易的,但OMDH问题是困难的,那么OMGDH就是困难的。 $G$是$q$阶乘法群。
不懂,有朋友明白的可以评论哈~
剩下的带补充吧~
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