摘要
为了有效解决签密系统中撤销用户的问题,提出了具有撤销功能的基于身份的签密方案。方案将主密钥随机分布在初始密钥和更新密钥中,再随机生成签密密钥,从而不仅能有效撤销用户,而且能抵抗密钥泄露攻击。在标准模型下,证明了该方案基于DBDH问题假设,具有不可区分性;基于CDH问题假设,具有不可伪造性。同时,任何第三方在不访问明文的情况下,均可验证签密密文。
An identity-based signcryption scheme with revocation is proposed in order to solve the problem of revoking users in the signcryption system. In this scheme,the master key is randomly distributed in the initial key and update key,which are used to generate the signcryption key randomly. Thus,the proposed scheme can revoke users effectively as well as resist key compromise attack. In the standard model,the scheme is proven to be indistinguishable and unforgettable against adaptive chosen ciphertext attacks and adaptive chosen message attacks under decisional bilinear Diffie-Hellman assumption and computational Diffie-Hellman assumption,respectively. Furthermore,any third party can verify the ciphertext without accessing plaintext.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2015年第6期856-860,共5页
Journal of Harbin Engineering University
基金
国家自然科学基金资助项目(61472470
61100229)
陕西省自然科学基金资助项目(2014JM2-6091
2015JQ1007)
广西信息科学实验中心经费资助(20130201)
关键词
签密
密钥泄露
撤销
可证明安全
公开可验证
signcryption
key compromise
revocation
provable security
public ciphertext verifiability
