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 rel...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.展开更多
In this paper, we present two forward-secure signature schemes （FSS） with untrusted update. Our constructions use ideas from the work of Abdalla et al. [1] and Kozlov and Reyzin [2] in their forward-secure digital s...In this paper, we present two forward-secure signature schemes （FSS） with untrusted update. Our constructions use ideas from the work of Abdalla et al. [1] and Kozlov and Reyzin [2] in their forward-secure digital signature schemes. Our schemes are proven to be forward-secure based on the hardness of factoring in the random oracle model. Both schemes use the same method to encrypt the private key and are more efficient than Libert scheme [3] without adding any burden to the original forward-secure schemes.展开更多
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)。
文摘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.
文摘In this paper, we present two forward-secure signature schemes （FSS） with untrusted update. Our constructions use ideas from the work of Abdalla et al. [1] and Kozlov and Reyzin [2] in their forward-secure digital signature schemes. Our schemes are proven to be forward-secure based on the hardness of factoring in the random oracle model. Both schemes use the same method to encrypt the private key and are more efficient than Libert scheme [3] without adding any burden to the original forward-secure schemes.
