A Study on Lightweight Anonymous CP-ABE Access Control for Secure Data Protection in Cloud Environment
Yong-Woon Hwang, Im-Yeong Lee · 2019
Recently, with the development of cloud computing technology, people can use the cloud to store their own data and share it with others. However, since the cloud is networked, there are various security threats in the network environment. To solve this problem, the CP-ABE access control scheme, which is an attribute-based encryption scheme, is used. However, a third party can deduce the attribute of the user who wants to access the data through the access policy specified in the cipher text, which can infringe the user's privacy. An anonymous CP-ABE scheme that protects user's privacy by giving anonymity to the access policy is being studied. However, since the size of the ciphertext increases as the number of attributes increases in the previously proposed anonymous CP-ABE scheme, the efficiency of the cloud storage space can be wasted. Also, the amount of computation of the user to decode is inefficient in proportion to the number of attributes. In this paper, we increase the efficiency of storage space by fixing the size of ciphertext regardless of the number of attributes. And we propose a anonymous CP-ABE access control technique that can increase the efficiency of the user's computation amount by supporting outsourcing techniques.