Improving User's Privacy for Multi-Authority ABE Using Privacy Homomorphism

Ang GAO  Zeng-Zhi LI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E96-A   No.3   pp.724-727
Publication Date: 2013/03/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E96.A.724
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Cryptography and Information Security
privacy protection,  privacy homomorphism,  attribute-based encryption,  multi-authority,  

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In order to improve user's privacy in multi-authority Attribute-Based Encryption (ABE), we propose a solution which hides user's attributes by privacy homomorphism, such that not only the “external” adversary fails to access the private attribute of one user by eavesdropping on communications, but also the “internal” Attribute Authorities (AA), who are responsible for issuing attribute keys, are unable to build a full profile with all of the user's attributes by pooling their information on the user's ID. Meanwhile, the use of ID is essential to defend against collusion attack on ABE. Benefiting from privacy homomorphism, by which we distribute the part of the interpolation for the shares abstracted by the hidden attributes into each AA, the performance of the proposed scheme is higher than those of existing ABE schemes.