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| Compared to the original ring signature scheme, conditionally anonymous ring signature allows to revoke the anonymity of the actual signer without the group manager's help, i.e., in case of dispute, the actual signer can be traced through signer's confirmation or the non-signers' disavowal. However, the previous conditionally anonymous ring signature schemes rely on random oracles, in the other words, the security of such schemes depend on the randomness of the hash functions. In order to improve the security, this paper proposes a ring signature scheme with traceability without random oracles in the common reference string model. |
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| Keywords:Conditional Anonymity; Ring Signature; Standard Model; NIZK Proof System |
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