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Attributes revocation through ciphertext puncturation
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DOI：10.1016/j.jisa.2019.06.011.png)
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Abstract
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In order to solve the difficult issue of attribute revocation in the attribute based encryption scheme, a novel method of revoking attributes through ciphertext puncturation is proposed. In this method, a ciphertext puncturation algorithm is designed and the NOT operator's ability to negate attributes in the non-monotonic access policy is utilized to revoke attributes. First, a non-monotonic access policy is constructed from the attributes revocation list. Then the ciphertext is punctured with this policy using the re-randomization technique. Finally, double policies exist in the ciphertext to implement access control. Without any interaction for private key update, the private key including any revoked attributes directly loses its decryption ability due to the puncturation of the ciphertext with the non-monotonic access policy containing revoked attributes. After puncturation, the ciphertext gets forward secrecy and attribute revocation is achieved. Theoretic analysis indicates that the proposed scheme maintains the security level of the attribute based encryption scheme with non-monotonic access policy and effectively completes attributes revocation. (C) 2019 Elsevier Ltd. All rights reserved.
Keywords:
Attribute based encryption
Revocation
Puncturation
Non-monotonic
Linear secret sharing
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