Multi-user search on the encrypted multimedia database: lattice-based searchable encryption scheme with time-controlled
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Multi-user search on the encrypted multimedia database: lattice-based searchable encryption scheme with time-controlled proxy re-encryption Xiaoling Yu1 · Chungen Xu1 · Bennian Dou1 · Yuntao Wang2 Received: 19 February 2020 / Revised: 15 August 2020 / Accepted: 27 August 2020 / © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Multimedia cloud storage which saves the huge storage overhead of local devices has attracted considerable attention. However, due to the lack of physical control of data, the privacy protection of data on the multimedia cloud has become one of the main concerns of users. Public-key encryption with keywords search (PEKS) is a technique that can keep the privacy and searchability of data in the cloud. In this paper, we present a PEKS with timecontrolled proxy re-encryption model which allows the data owner to delegate the access right of the encrypted multimedia database to other users, to achieve the time-controlled multi-user search. Furthermore, it is designed to resist keywords guessing attack and support conjunctive keywords search. Compared with previous works which require a time server to generate a time seal for the generation of the search token, this model embeds the time information of accessing the encrypted database into public and secret key pairs of data users, which saves the managing overhead and reduces the security risks resulting from an extra server. In addition, most existing PEKS schemes were constructed based on the hardness of classical mathematical problems which can be broken by quantum computers. To address this issue, a lattice-based PEKS scheme based on the above model is proposed, which can be considered as the candidate for protecting multimedia data security in the quantum era. Keywords Multimedia data security · Searchable encryption · Lattice assumption · Multi-user search · Time control
1 Introduction With the development of multimedia techniques, multimedia data, including image, audio, video is produced, which requires a lot of storage space. Besides, cloud computing technique can process efficiently tens of thousands of data and offer powerful network services. Chungen Xu
[email protected] 1
School of Science, Nanjing University of Science and Technology, Nanjing, 210094, China
2
School of Information Science, Security and Networks, Japan Advanced Institute of Science and Technology, Ishikawa, 9231292, Japan
Multimedia Tools and Applications
All of these facts attract enterprises and individual users to store their local data to the multimedia cloud. In the multimedia cloud storage, users will lose the physical control of data, which brings the issue of multimedia data privacy, especially for sensitive data, such as electronic medical image, electronic contract, the conference video on trade secrets, etc. To address this issue, users encrypt data before uploading them to the cloud server [21]. However, encryption reduces the readability and searchability of data. Public-key encryption with keywords search (PEKS)
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