A fully dynamic forward-secure group signature from lattice  

作　　者：Zhijian Liao Qiong Huang Xinjian Chen 

机构地区：[1]College of Mathematics and Informatics,South China Agricultural University,483 Wushan Road,Guangzhou 510642,China [2]Guangzhou Key Laboratory of Intelligent Agriculture,483 Wushan Road,Guangzhou 510642,China

出　　处：《Cybersecurity》2023年第1期40-53,共14页网络空间安全科学与技术（英文）

基　　金：This work is supported by the Major Program of Guangdong Basic and Applied Research(2019B030302008);National Natural Science Foundation of China(61872152);Science and Technology Program of Guangzhou(201902010081)。

摘　　要：A forward-secure group signature(FSGS)ensures the unforgeability of signatures in the past time period despite signing secret key is leaked in the current time period.As we know,traditional FSGS schemes are mostly relying on number-theoretic assumptions unable to resist quantum attacks.Therefore,we present an efficient lattice-based fully dynamic(ie.users can flexibly join or quit the group)forward-secure group signature(DFSGS)by combining an improved version of FSGS scheme proposed by Ling.Based on an efficient zero-knowledge argument,we construct argument of knowledge of the committed value and the plaintext that help with privacy protection.Our DFSGS scheme is proved to be anonymous and forward-secure traceable relying on short integer solution and learning with errors assumptions in random oracle model.Moreover,the lengths of group public key and signature of our DFSGS scheme have been improved,and the length of user secret key has no connection with the quantity of group members.

关 键 词：Dynamic group signature Forward-secure LATTICE SIS LWE Zero-knowledge argument 

分 类 号：TN915[电子电信—通信与信息系统]