Computer and Modernization

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CP-ABE Scheme with Attribute Revocation Under Environment of Multi-attribute Authority

  

  1. (College of Computer and Information, Hohai University, Nanjing 211100, China)
  • Received:2019-04-22 Online:2019-11-15 Published:2019-11-15

Abstract: Attribute-Based Encryption (ABE) can not only guarantee the security of data, but also realize fine-grained access control of data. In reality, due to user attributes may be frequently changed, it is very important to implement attribute revocation in ABE scheme. To solve the problem how to realize effective user decryption and key escrow in the existing schemes in the devices with limited computational efficiency, this paper proposes a revocable ABE scheme under multi-attribute authorization in cloud environment. In the proposed scheme, the client uses the outsourcing decryption technology to reduce the local computing load, and entrusts the updating of the combination key and ciphertext to the cloud server to realize the function of attribute revocation. The security analysis shows that this scheme has indistinguishable security under chosen plaintext attack. The performance analysis shows that the proposed scheme is more efficient.

Key words: attribute-based encryption, attribute revocation, multi-attribute authority

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