Some Open Issues and New Directions in Group Signatures
FC '99 Proceedings of the Third International Conference on Financial Cryptography
A Practical and Provably Secure Coalition-Resistant Group Signature Scheme
CRYPTO '00 Proceedings of the 20th Annual International Cryptology Conference on Advances in Cryptology
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Efficient identity-based encryption without random oracles
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
Strongly unforgeable signatures based on computational diffie-hellman
PKC'06 Proceedings of the 9th international conference on Theory and Practice of Public-Key Cryptography
Compact group signatures without random oracles
EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
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Supporting the privacy of the signer with controlled anonymity is an important feature of group signatures. However, since the group manager controls the anonymity of signer, the group manager can be a threat to the privacy of honest signers. Recently, OneCard service is popular in many ID card systems. In order to protect the singer's privacy against third party one can use group signature to verify that the user is a valid user for a specific service. If One Card service includes different levels of traceability requirements, then it must contain different sets of group signatures in order to preserve the privacy of the signer against the group manager. In this paper we propose a hierarchical identity based group signature scheme and introduce a way to provide enhanced privacy protection for signers against the group manager efficiently in the services with different levels of traceability requirements.