一个动态门限的基于属性签密方案

A Dynamic Threshold Attributes-based Signcryption Scheme

签密能同时实现加密与签名,并且代价小于传统的先签名再加密。该文在Li等人(2010)签名方案的基础上提出了一个动态门限的基于属性签密方案,除具有一般签密方案的保密性和认证性外,还同时具有签密者属性隐私安全性和多接收者特性。在随机预言机模型下,利用判定双线性Diffie-Hellman(DBDH)问题和计算Diffie-Hellman(CDH)问题的困难性,证明了该方案满足在适应性选择密文攻击下的不可区分性及适应性选择消息下的不可伪造性。

Signcryption combines the functionalities of signature and encryption and costs less than that required by the traditional signature-then-encryption approach. On the basis of Li et al. （2010） attribute-based signature, a new attributes-based signcryption is proposed in this paper, in which not only confidentiality and authentication is provided but also attribute-signcryptor privacy and multi-recipient is achieved. This scheme is provable secure in the random oracle model and it satisfies indistinguishability against adaptive chosen ciphertext attack based on Decisional Bilinear Diffie-Hellman （DBDH） assumption and chosen message attack based on the standard Computational satisfies existential unforgeability against adaptive Diffie-Hellman （CDH） assumption.