标准模型下高效的基于身份匿名广播加密方案

针对现实中广播加密的安全问题，提出一种标准模型下高效的基于身份匿名广播加密方案。匿名广播加密中广播者加密数据通过广播信道发送给用户，其中只有授权用户能够解密获得数据，同时任何人不能分辨出加密数据是发送给哪个用户的，从而保护了接收者用户的隐私。所提方案利用双系统加密技术，基于合数阶双线性群提出。同时，该方案基于静态假设，在标准模型中证明方案是选择明文安全的，密文和密钥取得了固定长度。和对比方案相比，所提方案密钥长度仅需2个群元素，同时方案满足匿名性。

Efficient identity-based anonymous broadcast encryption scheme in standard model

Concerning the broadcast encryption security problem in reality, a new identity-based anonymous broadcast encryption scheme in the standard model was proposed. In a anonymous broadcast encryption scheme, broadcaster sent encrypted data to the user via a broadcast channel, which only authorized users could decrypt and access the data; meanwhile, no one knew whom the encrypted data was sent to. Thereby the recipient user's privacy was protected. The scheme was proposed by combining with dual system encryption and composite-order bilinear groups. Based on static assumptions, the proposed scheme is chosen plaintext secure in the standard model, the ciphertext and private key in the scheme has fix length. Compared with the contrast scheme, the length of key is only two group elements, and the proposed scheme can satisfy the anonymity.