Cryptology ePrint Archive: Report 2021/1056

Revocable Attribute-Based Encryption for Multi-Keyword Search in Clouds

Chun-I Fan and Si-Jing Wu and Yi-Fan Tseng

Abstract: With the rapid advancement of cloud computing, users upload their files to the cloud server so that any user can access it remotely. To assure the data security, the data owner, typically, encrypts the data before outsourcing them to the cloud server. In addition, an encryption mechanism needs to enable the consumers to perform efficient searches of such encrypted data in the cloud storages through keywords, i.e. searchable encryption. However, most of searchable encryption is improper due to several limitations, such as the requirement of an on-line fully trusted third party, poor efficiency, high-overhead in user revocation, support of a single keyword search, etc. To mitigate such limitations, an attribute-based encryption scheme with fine-grained multi-keyword search is proposed. The new scheme supports the user revocation. In addition, the length of the ciphertext as well as the secret key do not grow linearly under the influence of the size of attribute set. The performance of the proposed scheme is better as compared to other related schemes. Hence, one can easily adopt the proposed scheme for the real life applications due to its flexibility in terms of its features, security and efficiency.

Category / Keywords: public-key cryptography / Attribute-Based Encryption, Multi-Keyword Search, User Revocation, Fine-Grained Search, Clouds

Date: received 13 Aug 2021

Contact author: yftseng at cs nccu edu tw

Available format(s): PDF | BibTeX Citation

Version: 20210816:132700 (All versions of this report)

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