A New Dynamic Conditional Proxy Broadcast Re-Encryption Scheme for Cloud Storage and Sharing

Zhanwen Chen, Jiageng Chen*, Weizhi Meng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Security of cloud storage and sharing is concerned for years since a semi-trusted party, Cloud Server Provider (CSP), has access to user data on cloud server that may leak users' private data without constraint. Intuitively, an efficient solution of protecting cloud data is to encrypt it before uploading to the cloud server. However, a new requirement, data sharing, makes it difficult to manage secret keys among data owners and target users. Therefore conditional proxy broadcast re-encryption technology (CPBRE) is proposed in recent years to provide data encryption and sharing approaches for cloud environment. It enables a data owner to upload encrypted data to the cloud server and a third party proxy can re-encrypted cloud data under certain condition to a new ciphertext so that target users can decrypt re-encrypted data using their own private key. But few CPBRE schemes are applicable for a dynamic cloud environment. In this paper, we propose a new dynamic conditional proxy broadcast reencryption scheme that can be dynamic in system user setting and target user group. The initialization phase does not require a fixed system user setup so that users can join or leave the system in any time. And data owner can dynamically change the group of user he wants to share data with. We also provide security analysis which proves our scheme to be secure against CSP, and performance analysis shows that our scheme exceeds other schemes in terms of functionality and resource cost.
Original languageEnglish
Title of host publicationProceedings of 18th IEEE International Conference on Dependable, Autonomic and Secure Computing
Number of pages8
PublisherIEEE
Publication date2020
Article number9251118
ISBN (Print)9781728166094
DOIs
Publication statusPublished - 2020
Event18th IEEE Int’l Conference on Dependable, Autonomic and Secure Computing - Calgary, Canada
Duration: 22 Jun 202026 Jun 2020

Conference

Conference18th IEEE Int’l Conference on Dependable, Autonomic and Secure Computing
Country/TerritoryCanada
CityCalgary
Period22/06/202026/06/2020

Keywords

  • Data sharing
  • Cloud storage
  • Broadcast encryption
  • Proxy re-encryption

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