根据MOV归约理论，采用双线性映射构造的基于身份加密方案使得该方案不具有椭圆曲线高效的优点。

According to the MOV reduction theory, the identity-based encryption scheme which is based on the bilinear map will lose the high efficiency of elliptic curve.

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在简化pki系统的研究中，本文首先介绍基于身份的加密算法，然后结合单向哈希链，提出一种基于IBE的改进PKI系统。

In the research of simplifying PKI system, this paper proposes an improved PKI system based on the combine of the IBE and the one-way hash chain.

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同时，基于身份加密的公钥密码系统中也存在着一些问题，如身份认证、私钥分发以及密钥托管等。

However, there are some problems in IBE such as identity authentication, private key distribution, key escrow and so on.

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