An effective and secured authentication and sharing of data with dynamic groups in cloud

Abstract

Cloud computing framework facilitates users to save data in the cloud server for using desired and scalable services. The data sharing in the cloud facilitates several contributors to generously distribute group data. However, how to facilitate data security in group and how to effective outsourced data are major issues in the existing methods. The aim of this research is to devise a technique for privacy preservation with data sharing in the cloud. The method includes nine phases, like set-up phase, user-registration phase, key generation phase, revocation phase, file generation, authentication, encryption, file access and verification, and decryption. In setup, the group manager performs the initialization of the system. In user registration, the registration of group members is done with group manager. In the key generation phase, a common key is generated amongst group members. In the user revocation phase, the user revocation is done with the group manager. In the file encryption phase, the member encrypts the data file. In the file generation phase, the data file are accumulated in the cloud. The file access phase helps to access the file from the cloud. Here, the authentication phase helps to access the cloud and the decryption phase helps to verify authorized users using the signature. The proposed privacy-based group data sharing outperformed with the highest detection rate of 95%, smallest computation cost of 719 s and smallest memory of 56991123 bytes.