Edge-Cloud-Assisted Multiuser Forward Secure Searchable Encryption (EMFSSE) Scheme in the P2P Networking Environment

Yongli Tang,Qiang Zhao,Xixi Yan,Jingran Li,Han Wang

doi:10.1155/2021/7003252

Abstract

P2P network enables users to share resources effectively. However, with the advent of the big data era, the sensitive data of users in P2P network are also increasing dramatically. In order to solve the contradiction between the huge amount of sensitive data and the limited local storage space, an increasing number of users choose to encrypt their sensitive data and store them in the cloud server. For the problem of the secure storage and flexible access of large amounts of user data in P2P networks, an edge-cloud-assisted multiuser forward secure searchable encryption scheme is proposed. The scheme uses the proxy reencryption technique to optimize the multiuser searchable encryption and prevent the decryption key from being directly transmitted between users. By introducing an edge-cloud architecture, the system achieves efficient communication and timely response capabilities. The security analysis proves that our scheme achieves the CPA (chosen-plaintext attack) security based on DBDH assumption and the forward privacy. Finally, the theoretical and experimental comparisons between this scheme and other schemes show that our scheme has high efficiency in the process of data update, search, and trapdoor generation. In addition, due to the use of edge-cloud architecture, our scheme reduces about 90% and 75% of the user’s consumption in the encryption and token generation process.

Highlights

P2P network file sharing system has been widely used and has rapidly developed because of its various advantages, such as decentralization, good extendibility, strong robustness, high cost-effectiveness, and load balancing characteristics [1,2,3]
In order to prevent the disclosure of the decryption key, this paper introduces the proxy reencryption technique. e authorized proxy transforms the ciphertext provided by the data owner into another ciphertext that can be decrypted by the data user. en, the data user can download the ciphertext alone and decrypt it with his own private key to get the original plaintext
N is the number of indexes containing the keyword w; E1 and E2 represent the multiplication in groups G1 and G2, respectively; e is a bilinear pair; M represents secure map-to-point operation; H means the secure hash function; T/T− 1 represents trapdoor function and its inverse operation, respectively; F/F− 1 represents a pair of pseudorandom permutations

Summary

Introduction

P2P network file sharing system has been widely used and has rapidly developed because of its various advantages, such as decentralization, good extendibility, strong robustness, high cost-effectiveness, and load balancing characteristics [1,2,3]. Searchable encryption technology can ensure data security and flexible access during remote storage, which reduces local storage and computational cost and achieves more flexible and convenient data access. In reality, there is a huge physical and logical distance between the client and the cloud server, which reduces the efficiency of data collection, transmission, and analysis, causes the delay of the communication process, and hinders the timely response ability of the whole system. With the help of edge computing, clients store some data information on the nearest edge platform, and the edge platform retrieves the data according to authorization, thereby limiting unnecessary data upload to the cloud, saving communication costs, and providing more efficient

Methods

Results

Conclusion