Computer Science ›› 2017, Vol. 44 ›› Issue (5): 160-165.doi: 10.11896/j.issn.1002-137X.2017.05.028

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Publicly Accountable Ciphertext-policy Attribute-based Encryption Scheme

MA Xiao-xiao and YU Gang   

  • Online:2018-11-13 Published:2018-11-13

Abstract: Ciphertext-policy attribute-based encryption (ABE) enables fine-grained access control of decryption privilege by using the matching relation between the attribute set and the access structure,and is a promising one-to-many encryption primitive which has a bright application prospect in cloud computing,big data etc.However,an attribute set may be owned by many users in ABE, i.e. one decryption key may belong to many users.Thus,malicious users dare to leak their decryption privileges to others for profits.Furthermore,a semi-trust authority may illegally generate decryption keys to unauthorized users.To solve these two kinds of key abuses in ABE,we proposed a publicly accountable ciphertext-policy attribute-based encryption scheme by embedding both signatures of user and authority into the secret key.The proposed scheme can achieve traceability and accountability,in which anybody can trace the identity of a leaked decryption key,and an auditor can verify whether the leaked key is shared by a malicious user or is illegally generated by a semi-trust authority.At last,the security of the proposed scheme can be proved based on the security of its atomic encryption and signature schemes.

Key words: Attribute-based encryption,Traceability,Public accountability,Nonrepudiation

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