密码学报2018，Vol.5Issue(1)：55-67,13.DOI:10.13868/j.cnki.jcr.000218
无双线性对的基于证书多域条件代理重加密方案
Pairing-free Certificate-based Multi-domain Conditional Proxy Re-encryption Scheme
摘要
Abstract
The existing certificate-based conditional proxy re-encryption(CB-CPRE)schemes effec-tively support the data confidentiality in the cloud environment,and have solved the heavy certificate management problem and the key escrow problem. However,the existing certificate-based conditional proxy re-encryption schemes still have some drawbacks in applications,considering when the delegator and the delegatee are in a same domain(intra-domain). In the new cloud environment,users from the same domain or different domains need to share data and different service providers need to cooperate with each other to provide cloud services for users. Thus,we propose the definition and security model of certificated-based multi-domain conditional proxy re-encryption(CB-MD-CPRE)by combining the concept of multi-domain and the existing schemes. Then users in the inter-domain can access each oth-er's data,hence the above problem can be solved effetively. Integrating with the elliptic curve group,a pairing-free certificated-based multi-domain conditional proxy re-encryption scheme is proposed and is proved to be indistinguishable against adaptive chosen-ciphertext attack in the random oracle model. Finally,compared with other related schemes,the proposed scheme has obvious advantages in perfor-mance and computational complexity,where the delegator can flexibly authorize the decryption rights based on a condition. The proposed scheme allows users from the same domain or different domains to share data,and is more suitable for cloud computing applications.关键词
条件代理重加密/无双线性对/多域中选择密文安全Key words
conditional proxy re-encryption/pairing-free/chosen-ciphertext security in multi-domain分类
信息技术与安全科学引用本文复制引用
徐洁如,陈克非,沈忠华,徐晓栋..无双线性对的基于证书多域条件代理重加密方案[J].密码学报,2018,5(1):55-67,13.基金项目
国家重点研发计划课题 (2017YFB0802003) （2017YFB0802003）
浙江省自然科学基金项目 (LQY18G030001) National Key Research and Development Program of China(2017YFB0802003) （LQY18G030001）
Natural Science Foun-dation of Zhejiang Province (LQY18G030001) （LQY18G030001）
