可公开验证的短密钥公钥加密方案

Publicly verifiable public key encryption scheme with short keys

利用一个选择身份安全的基于身份加密方案(IBE)和2个目标抗碰撞散列函数,构造了一个可公开验证的公钥加密方案。在判定性BDHI假设的基础上,证明了新方案在标准模型下是适应性选择密文安全的。相比现有可公开验证的公钥加密方案,新方案的公私钥长度较短且与安全参数相互独立。

Based on a selective identity secure identity-based encryption scheme and two target collision resistant hash functions, a new public verifiable encryption scheme was presented. The adaptively chosen ciphertext security of the new scheme was proved under the decisional BDHI assumption in the standard model. Furthermore,new scheme has very short public and private keys that are independent of the security parameter.