计算机科学
代理重新加密
云计算
加密
可验证秘密共享
计算机安全
代理(统计)
方案(数学)
计算机网络
公钥密码术
操作系统
数学
机器学习
数学分析
集合(抽象数据类型)
程序设计语言
作者
Chunpeng Ge,Willy Susilo,Joonsang Baek,Zhe Liu,Jinyue Xia,Liming Fang
标识
DOI:10.1109/tdsc.2021.3076580
摘要
To manage outsourced encrypted data sharing in clouds, attribute-based proxy re-encryption (ABPRE) has become an elegant primitive. In ABPRE, a cloud server can transform an original recipient's ciphertext to a new one of a shared user's. As the transformation is computation consuming, a malicious cloud server may return an incorrect re-encrypted ciphertext to save its computation resources. Moreover, a shared user may accuse the cloud server of returning an incorrect re-encrypted ciphertext to refuse to pay the cost of using the cloud service. However, existing ABPRE schemes do not support a mechanism to achieve verifiability and fairness. In this article, a novel verifiable and fair attribute-based proxy re-encryption (VF-ABPRE) scheme is introduced to support verifiability and fairness. The verifiability enables a shared user to verify whether the re-encrypted ciphertext returned by the server is correct and the fairness ensures a cloud server escape from malicious accusation if it has indeed conducted the re-encryption operation honestly. Additionally, we conduct a performance experiment to show the efficiency and practicality of the new VF-ABPRE scheme.
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