Abstract
Broadcast proxy reencryption (BPRE), which combines broadcast encryption (BE) and proxy reencryption (PRE), is a technology used for the redistribution of data uploaded on the cloud to multiple users. BPRE reencrypts data encrypted by the distributor and then uploads it to the cloud into a ciphertext that at a later stage targets multiple recipients. As a result of this, flexible data sharing is possible for multiple recipients. However, various inefficiencies and vulnerabilities of the BE, such as the recipient anonymity problem and the key escrow problem, also creep into BPRE. Our aim in this study was to address this problem of the existing BPRE technology. The partial key verification problem that appeared in the process of solving the key escrow problem was solved, and the computational efficiency was improved by not using bilinear pairing, which requires a lot of computation time.
Highlights
The cloud technology allows users to access a range of services anytime, anywhere
Broadcast proxy reencryption is a combination of broadcast encryption technology and proxy reencryption technology
The broadcast encryption method is effective when distributing the same data to multiple recipients at the same time because multiple recipients can be specified with only one encryption
Summary
The cloud technology allows users to access a range of services anytime, anywhere. Depending on the requirement of users, the cloud provides a range of services, including software-as-a-service (SaaS), platform-as-a-service (PaaS), and infrastructure-asa-service (IaaS). The private keys of the sender and receiver are not exposed to risks during data sharing and the cloud, too, has no access to the contents of the encrypted data. Because this PRE is based on one-to-one transmission, it is not suitable for environments where the same data are distributed to multiple recipients (for example, environments such as update servers or secure e-mail). The goal of this study is to provide a relatively safe environment for data sharing by solving the security threats presented above, as well as to develop a more efficient BPRE technology by leaving out the bilinear pairing operation
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