Revocable ABE with Bounded Ciphertext in Cloud Computing

10.6633/IJNS.201711.19(6).14

Mohamed Ali Hamza；Jianfei Sun；Xuyun Nie；Zhiquan Qin；Hu Xiong

Access Control ； Attributes Based Encryption ； Bounded CipherText ； Key Policy ； Revocation ； Revocable Storage Attribute-based Encryption

International Journal of Network Security

19卷6期（2017 / 11 / 01）

973 - 983

英文

Revocable Attribute-Based Encryption (R-ABE) has received much concern recently due to its characteristic of capability on encrypting the Data, according to some at- tributes, whereas users can decrypt the ciphertexts if they own the credential of those attributes with ability to revoke the expired users. We propose a new practical Revocable Attribute Based Encryption which has a short ciphertext O(1) and private keys O(1) with efficient running time. In this scheme the users can effectively be revoked and added with backward and forward secrecy in the indirect mode, which can controlled by Key Authority Party without reseting the system parameter's or updating and redistributing the attributes private keys which has expense. Assuming the cloud provider is semi-honest and has been delegated by KA in order to apply dynamic processing on the data and controlling users. This scheme is secured against Chosen Plaintext Adversary (CPA), assuming the (Decision) Bilinear Diffie-Hellman Exponent assumption (n-BDHE) is being held.