一种安全有效的基于身份的门限签密方案

签密是一种将加密和数字签名技术结合在一起的思想,它比采用先签名后加密的方法具有更高的效率.基于双线性对技术,提出了一种新的基于身份的门限签密方案.它利用决策双线性Diffie-Hellman(DBDH)问题的困难性在随机预言模型下给出了方案的语义安全性证明,并利用计算Diffie-Hellman(CDH)问题的困难性证明了方案的不可伪造性,同时指出方案具有较高的效率.

Secure and efficient identity-based threshold signcryption scheme

The idea of signcryption is to provide a method to encrypt and sign data together in a way that is more efficient
than using a signature scheme combined with an encryption scheme. A new identity-based threshold signcryption scheme
is presented based on the bilinear pairings, which proves its semantic security on the hardness of decisional bilinear
diffie-hellman(DBDH)problem and its unforgeability on the hardness of computational diffie-hellman(CDH) problem in
the random oracle model. In addition, the scheme is proved to be efficient.