Cloud-assisted Two-Factor Protection Mechanism for Public Data in Smart Campus

Two-factor data security protection in cloud environments has become a research hotspot in recent years. With the rapid development of cloud computing, how to achieve the two-factor protection of public data resources in the cloud is a serious problem to be tackled. Furthermore, how to achieve both security and revocability is a challenge for two-factor too. In this paper, we propose a cloud-assisted two-factor protection mechanism with factor revocability for public data in smart campus. The proposed mechanism allows a data owner to send an encrypted message to user through a cloud. The data owner is required to formulate access policies and perform attribute-based encryption on messages. In order to decrypt, the user needs to possess two factors. The first factor is user’s secret key. The second factor security equipment is a campus card in this paper. The ciphertext can be decrypted if and only if the user gathers the key and the security equipment at the same time. Analysis and experimental results demonstrate that the proposed mechanism is secure, efficient and practical.