Ciphertext-Policy Attribute-Based Encryption with Short Keys  

作　　者：XU Peng TANG Yong JIANG Wenbin JIN Hai ZOU Deqing 

机构地区：[1]Services Computing Technology and System Lab, Cluster and Grid Computing Lab, School of Computer Science and Technology, Huazhong University of Science and Technology

出　　处：《Chinese Journal of Electronics》2014年第4期655-660,共6页电子学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61100222);the National Program on Key Basic Research Project(973 Program)(No.2014CB340600)

摘　　要：Ciphertext-policy attribute-based encryption(CP-ABE)allows a user with some attributes to decrypt the ciphertexts associated with these attributes.Though several CP-ABE schemes with the constant size ciphertext were proposed to reduce the communication cost,their master public and secret keys still have the size linear in the total number of attributes.These schemes are unpractical for the attribute-scalable and many-attributes scenario.A new CP-ABE scheme is proposed.Each attribute is mapped to a mathematical value by a combination method.The master public and secret keys of the proposed CP-ABE scheme have the size linear in the binary size of a hash function’s range.It has the comparable performance with existing schemes in the aspects like the time costs of encryption and decryption,the expressiveness of access policy and the provable security.Ciphertext-policy attribute-based encryp- tion （CP-ABE） allows a user with some attributes to decrypt the ciphertexts associated with these at- tributes. Though several CP-ABE schemes with the con- stant size ciphertext were proposed to reduce the commu- nication cost, their master public and secret keys still have the size linear in the total number of attributes. These schemes are unpractical for the attribute-scalable and many-attributes scenario. A new CP-ABE scheme is pro- posed. Each attribute is mapped to a mathematical value by a combination method. The master public and secret keys of the proposed CP-ABE scheme have the size linear in the binary size of a hash function＇s range. It has the comparable performance with existing schemes in the aspects like the time costs of encryption and decryption, the expressiveness of access policy and the provable security.

关 键 词：Ciphertext-policy attribute-based encryption Expressiveness policy  Provable security. 

分 类 号：TN918.4[电子电信—通信与信息系统]