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Searchable Attribute-Based Mechanism with Ef?cient Data Sharing for Secure Cloud Storage

Attribute-Based Mechanism with Ef?cient Data Sharing for Secure Cloud Storage
Abstract-Synopsis-Documentation

Searchable Attribute-Based Mechanism with Efficient Data Sharing for Secure Cloud Storage


Abstract


To date, the growth of electronic personal data leads to a trend that data owners prefer to remotely outsource their data to clouds for the enjoyment of the high-quality retrieval and storage service without worrying the burden of local data management and maintenance. However, secure share and search for the outsourced data is a formidable task, which may easily incur the leakage of sensitive personal information. Efficient data sharing and searching with security is of critical importance. This paper, for the first time, proposes a searchable attribute-based proxy re-encryption system. When compared to existing systems only supporting either searchable attribute-based functionality or attribute-based proxy re-encryption, our new primitive supports both abilities and provides flexible keyword update service. Specifically, the system enables a data owner to efficiently share his data to a specified group of users matching a sharing policy and meanwhile, the data will maintain its searchable property but also the corresponding search keyword(s) can be updated after the data sharing. The new mechanism is applicable to many real-world applications, such as electronic health record systems. It is also proved chosen cipher text secure in the random oracle model. Keywords: Searchable attribute-based encryption, keyword update, encrypted data sharing

Architecture

Proposed System:


Attribute-Based Proxy Re-Encryption (ABPRE). To efficiently share an encrypted data with others, Mambo and Okamoto introduced PRE whereby a semi-trusted proxy can transform an encryption of a message to another encryption of the same message without knowing the message. To employ the notion into ABE setting, Liang et al. proposed the notion of ABPRE. Recently, Liang et al. introduced new types of ABPRE with stronger security. Nonetheless, these systems cannot achieve our goals as they do not provide privacy-preserving keyword search.

Sahai and Waters  introduced the notion of ABE. After that, Goyal et al.  proposed a KP-ABE system, in which ciphertexts are associated with attributes, and secret keys are associated with access policies (over attributes). Later on, many classic ABE systems and their variants that have been proposed in the literature.

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