Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme

XU Jing-fang1; CUI Guo-hua1; CHENG Qi2; ZHANG Zhi1

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Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme

更新时间：2024-10-14

- Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme
- Vol. 30, Issue 10, Pages: 118-123(2009)
- 作者机构：
  
  1. 华中科技大学计算机学院信息安全实验室
  2. 武汉市数字工程研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN918.1
- Published：2009
- 稿件说明：
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XU Jing-fang1, CUI Guo-hua1, CHENG Qi2, et al. Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme[J]. 2009, 30(10): 118-123.
DOI：

XU Jing-fang1, CUI Guo-hua1, CHENG Qi2, et al. Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme[J]. 2009, 30(10): 118-123. DOI：

摘要

针对一个秘密共享新个体加入协议

具体地给出了2种攻击

使得不良的广播接收者可以很容易的恢复出t个旧成员的秘密份额si

进而恢复出新个体的秘密份额sn+1和主秘密S

并且证明了导致这2种攻击成功的根本原因。此外

提出了一个新的改进方案

改进方案不仅弥补了原方案的安全缺陷

而且与已有的协议相比需要更少的通信量。

Abstract

Cryptanalysis of a non-interactive protocol for member expansion in a secret sharing scheme was presented

in which a malicious broadcast receiver might easily recover old t shares

new share and further reconstruct the secret S. The claimed security could not be realized. In addition

a new protocol was proposed

which elaborately eliminates the defect of previous protocol and improved the efficiency of existing schemes.

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