Visible to the public A New Dynamic Conditional Proxy Broadcast Re-Encryption Scheme for Cloud Storage and Sharing

TitleA New Dynamic Conditional Proxy Broadcast Re-Encryption Scheme for Cloud Storage and Sharing
Publication TypeConference Paper
Year of Publication2020
AuthorsChen, Z., Chen, J., Meng, W.
Conference Name2020 IEEE Intl Conf on Dependable, Autonomic and Secure Computing, Intl Conf on Pervasive Intelligence and Computing, Intl Conf on Cloud and Big Data Computing, Intl Conf on Cyber Science and Technology Congress (DASC/PiCom/CBDCom/CyberSciTech)
KeywordsBroadcast Encryption, Broadcasting, cloud computing, Cloud Server Provider, cloud storage, composability, conditional proxy broadcast re-encryption technology, cyber physical systems, data encryption, data owner, data privacy, data sharing, dynamic cloud environment, dynamic conditional proxy broadcast re-encryption scheme, dynamic conditional proxy broadcast reencryption scheme, efficient encryption, Encryption, fixed system user setup, Focusing, party proxy, Performance analysis, private key cryptography, Proxy re-encryption, pubcrawl, re-encrypted cloud data, re-encrypted data, Resiliency, Secure storage, Servers, sharing approaches, storage management, system user setting, target user group, telecommunication security, Tools, user data
AbstractSecurity 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.
Citation Keychen_new_2020