密码学报2016，Vol.3Issue(3)：307-320,14.DOI:10.13868/j.cnki.jcr.000130
标准模型下基于身份的广义代理签密*
Identity-Based Generalized Proxy Signcryption in the Standard Model
摘要
Abstract
Both generalized signcryption and combined public key cryptosystem can realize encryption, signature and signcryption to share one key pair, and generalized signcryption can also realize them to share one algorithm. In this paper, we introduce a new concept called generalized proxy signcryption based on these two notions. Generalized proxy signcryption can realize proxy signature and proxy signcryption to share one key pair and one algorithm, which will significantly improve the efficiency of cryptosystems with a large number of users, storage-constrained environments or possible changes in the functional requirements. We give a formal definition and security model of generalized proxy signcryption in the identity-based cryptosystem setting, and propose a concrete scheme in the identity-based setting in the standard model by using bilinear pairing. The scheme has the properties of public verification in the proxy signcryption mode, resisting proxy key exposure attack, having self-delegation, short system public parameters and it does not need a secure channel between the original signer (signcrypter) and the proxy signer (signcrypter). Under adaptive chosen ciphertext, chosen identity and chosen warrant attack, the confidentiality of our scheme can be reduced to the DBDH hard problem; under adaptive chosen message, chosen identity and chosen warrant attack, the unforgeability of our scheme can be reduced to the CDH hard problem. At last, we compare our scheme with others. The result shows that it is a high efficient scheme.关键词
代理签名/代理签密/广义代理签密/组合公钥密码/标准模型/双线性对Key words
proxy signature/proxy signcryption/generalized proxy signcryption/combined public key cryptosystem/standard model/bilinear pairing分类
信息技术与安全科学引用本文复制引用
周才学..标准模型下基于身份的广义代理签密*[J].密码学报,2016,3(3):307-320,14.基金项目
国家自然科学基金项目(61462048,61562047) （61462048,61562047）
九江学院校级重点课题(2013ZD02) （2013ZD02）
