秘密共享新个体加入协议的安全性分析与改进  

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

作　　者：许静芳[1] 崔国华[1] 程琦 张志[1] 

机构地区：[1]华中科技大学计算机学院信息安全实验室,湖北武汉430074 [2]武汉市数字工程研究所,湖北武汉430074

出　　处：《通信学报》2009年第10期118-123,共6页Journal on Communications

基　　金：国家自然科学基金项目(60403027)~~

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。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.

关 键 词：秘密共享 新个体加入 秘密份额恢复 

分 类 号：TN918.1[电子电信—通信与信息系统]