ABSTRACT
Cloud computing is a new application model. It can significantly reduce the operating costs and improve operational efficiency. With the continuous development of cloud computing technology, security and privacy have become the biggest obstacle to cloud computing applications. Access control technology is an important measure and means to protect the access and data security of cloud services in cloud computing environment. In the cloud computing environment, massive data grows with each passing day, which makes the data of Internet more and more abundant. At the same time, it also leads that the storage space of the third party cloud service provider has enormous challenges. Based on the Hadoop cloud platform, a hierarchical Ciphertext-Policy Attribute-Based Encryption (CP-ABE) access control model with constant-length decryption key is proposed and implemented in Hadoop cloud environment. The model not only has the characteristics of constant-length decryption key, hierarchical authorization structure, reduction of the computation quantity, but also is proved that the model can realize the efficient access control of encrypted data in the cloud computing environment, and solve the problem of limited cloud storage space.
