Based on the bilinear pairings and hierarchical identity-based encryption ,an identity-based encryption with wild-card is proposed to overcome the loose security reduction and computation inefficiency of the known schemes .Our proposed scheme is provably secure in the standard model which captures tight secure reduction .In our scheme ,no pairing computation is needed in the encrypt algorithm and the decrypt algorithm requires only two pairings computations .A security analysis shows that the proposed scheme has the indistinguishability against adaptive chosen ciphertext and identity with wildcard attack under the assumption of De-cision Modify Bilinear Diffie-Hellman Exponent .%针对通配符基于身份加密方案中安全归约不紧密以及运算量大的缺陷，利用双线性对和分级基于身份加密的思想提出标准模型下可证安全的通配符基于身份加密方案。新方案取得紧密的安全归约，同时加密算法不需要对运算，解密算法仅仅需要2个对运算。安全性分析表明，基于改进判定双线性Diffie-Hellman指数假设下，所提方案在适应性选择密文和通配符身份攻击下满足不可区分性。
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