标准模型下可公开验证的匿名IBE方案

利用弱困难性假设构造强安全的加密系统在基于身份的加密（ Identity-Based Encryption ，IBE）中具有重要的理论与实际意义。本文基于弱困难性的判定性双线性Diffie-Hellman假设，构造了一个对于选择明文攻击安全的匿名的身份加密方案，解决了利用弱困难性假设构造强安全的基于身份加密系统的问题，同时也解决了基于身份的加密系统的隐私保护问题。与现有的基于较强困难性假设的方案相比，新方案实现的条件更容易满足，可以公开验证而且效率更高。

A Publicly Verifiable Anonymous IBE Scheme in the Standard Model

Constructing a stronger security encryption system based on a weaker computationally hard assumption is of great theoretical and practical importance in identity-based encryption.To solve this problem,we,based on a weaker as-sumption that the decisional bilinear Diffie-Hellman problem is hard, construct an anonymous identity-based encryption scheme which is secure against adaptively chosen ciphertext attack.This scheme can prevent an identity-based encryption system from disclosing privacy.Compared with the existing schemes based on stronger computationally hard assumption,the prerequisite of our scheme can be satisfied more easily,besides,it is publicly verifiable and more efficient.