Study on User Permissions Management Based on Attribute for Cloud Environment
LI Shuan-ba · 2014
User permissions assignment is one of the important challenges of cloud computing services.We proposed an user permissions management scheme based on an attribute.The program make the key distribution of new users in cloud services as the study object,which discusses the multi-collaborative signature verification and decryption management mechanism.Data owners and authority commonly decide on attribute set,and data owner defines ciphertext access structure based on the attribute set,so that only authorized users who hasbeen certified can get the decryption key,to upgrade and downgrade synchronously user permissions management.In addition,we designed CP-ABE group signature verification decryption mechanism by updating-centric for group attribute set,which constitutes group of data owners,users and authority.Users can sign message and publicly verifiability by combining group and own attribute so that the fine-grained access control of ciphertext data can be protected.At last,the validity and unforgeability of the signature can be proved.