Multi-user file sharing scheme in cloud environment

Multi-user file sharing scheme in cloud environment

Wang Zhenghua Han Yu Liu Jichang

With the rapid development of cloud storage technology, More and more users use cloud storage services to transfer local file storage to the cloud to implement file sharing with multiple users. Aiming at the problem of different access rights for multiple users sharing the same file in cloud environment, an efficient multi-user file sharing scheme is proposed. The new scheme is based on ElGamal encryption system and proxy encryption technology, and realizes that the file owner can only add A secret one can enable shared users to access different content goals. Compared with the existing scheme, the advantages of the new scheme are as follows: At the same time, when the Milvensen storage space is guaranteed, the computational amount of the file owner's encryption of the shared file is linearly increasing with the exponential encryption of the file block number; Shared users can decrypt files by just a linear number of exponential decryption operations to access their different file content. The analysis shows that the new scheme is more suitable for the characteristics of cloud computing environment, that is, cloud service provider can provide unlimited computing and storage ability for thin client users.

Multi-user file sharing scheme in cloud environment