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A Traceable and Revocable Ciphertext-Policy Attribute-based Encryption…

- - - - to solve the problem of decryption key leakage and trace the malicious user
        
        Traceability
        
        black-box traceability
        
        is given a decryption device, while decryption key and even the decryption algorithm is able to trace the malicious user of the decryption algorithm could be hidden in the device
        
        white-box traceability
        
        can trace the malicious user by a well-formed decryption key
      - Need a revocation mechanism after a malicious user is traced
        
        traceable-then-revocable ciphertext-policy attribute-based encryption scheme
        
        problems
        
        cannot resist to anti-collusion attacks
      - revocable CP-ABE
      - Paper
        
        Attribute-Based Encryption for
        Fine-Grained Access Control of Encrypted Data
    - - partially hidden policy
      - fully hidden policy
    - - leak the decryption key to third parties in ABE systems