Secure cloud file system with attribute based encryption

File distributing and sharing is one of the most commonly used services in cloud computing and the requirement of data security grows with the cloud computing spreading. Attribute based encryption is one of the most attractive way to manage and control file sharing in cloud with its special attribute computing properties. In this paper, a novel secure file sharing scheme based on attribute controlling is presented. In order to design a practical cloud file system with attribute based encryption, we give a systematic definition of attribute computing in cloud computing environment. Based on the definition, we design a secure and practical attribute based encryption scheme without pairings (CP-ABE-WP) under cloud computing scenarios. According to our analysis and test, the scheme is chosen plaintext secure in selective ID model and can satisfy the file sharing application in cloud computing.