一种新的不含随机预言模型的公钥加密方案

2004年的欧密会上,Canetti,Halevi和Katz提出了将Selectivre-ID安全的基于身份加密方案转化为选择密文安全的公钥加密方案的方法。但由于该方法需要用到一次性签名,给所基于的方案增加了明显的通信和计算负载。为了提高加密过程的计算效率,作者在本文中介绍了一种从Boneh-Boyen提出的选择性的基于身份的加密方案到公钥加密方案的转换方法,该方法是公开可验证的,其效率也有了提高。该方案是基于决定性双线性Diffie-Hellman假设和抗碰撞哈希函数的。

A New Public-key Encryption Scheme Without Random Oracles

In Eurocrypt 2004, Canetti, Halevi and Katz proposed a method for constructing Chosen Ciphertext secure public-key encryption from any Selective-ID secure ID-Based Encryption （IBE）. However, this method needs one time signature and thus adds noticeable overhead to the underling scheme. To enhance the computational efficiency, the author introduce another technique from the Boneh-Boyen＇s selective identity-based encryption scheme to a public-key encryption which is publicly verifiable and more efficient. The proposed public-key encryption scheme is based on the decisional bilinear Diffie-Hellman assumption and the target collision resistant hash functions.