Practical forward secure group signature schemes
CCS '01 Proceedings of the 8th ACM conference on Computer and Communications Security
Dynamic Accumulators and Application to Efficient Revocation of Anonymous Credentials
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Short Signatures from the Weil Pairing
Journal of Cryptology
Group signatures with verifier-local revocation
Proceedings of the 11th ACM conference on Computer and communications security
Quasi-efficient revocation of group signatures
FC'02 Proceedings of the 6th international conference on Financial cryptography
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Verifier-Local revocation group signature schemes with backward unlinkability from bilinear maps
ASIACRYPT'05 Proceedings of the 11th international conference on Theory and Application of Cryptology and Information Security
Universally convertible directed signatures
ASIACRYPT'05 Proceedings of the 11th international conference on Theory and Application of Cryptology and Information Security
An efficient group signature scheme from bilinear maps
ACISP'05 Proceedings of the 10th Australasian conference on Information Security and Privacy
A short verifier-local revocation group signature scheme with backward unlinkability
IWSEC'06 Proceedings of the 1st international conference on Security
More Efficient VLR Group Signature Satisfying Exculpability
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Revocable Group Signature Schemes with Constant Costs for Signing and Verifying
Irvine Proceedings of the 12th International Conference on Practice and Theory in Public Key Cryptography: PKC '09
ProvSec'10 Proceedings of the 4th international conference on Provable security
Shorter verifier-local revocation group signature with backward unlinkability
Pairing'10 Proceedings of the 4th international conference on Pairing-based cryptography
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Previously Verifier-Local Revocation (VLR) group signature schemes from bilinear maps were proposed. In VLR schemes, only verifiers are involved in the revocation of a member, while signers are not. Thus, the VLR schemes are suitable for mobile environments. Furthermore, the previously proposed schemes satisfy the important backward unlinkability. This means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. This property is needed in case of a voluntary leave of a member or in case of a key loss. However, in the previous schemes, signatures become long, due to the adopted assumption, which should be improved in order to apply the schemes to the mobile environments. In this paper an improved VLR scheme is proposed with the shorter group signatures. This is achieved by using a different assumption, DLDH assumption, and improving zero-knowledge proofs in the group signatures. The length of the proposed group signatures is reduced to about 53% of that of the previous ones.