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Efficient Equality Test on Identity-Based Ciphertexts Supporting Flexible Authorization.

Na Li1

  • 1State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Entropy (Basel, Switzerland)
|February 25, 2023
PubMed
Summary

This study introduces a more efficient identity-based encryption scheme for secure cloud data access control. The new method significantly reduces computational costs while maintaining robust security against sophisticated attacks.

Keywords:
cloud storageequality testidentity-based encryptiontrapdoor discrete log groups

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Area of Science:

  • Cryptography
  • Cloud Computing Security
  • Data Privacy

Background:

  • Cloud storage necessitates robust data access control for encrypted data.
  • Existing public key encryption schemes with equality tests (PKEET-FA) and identity-based encryption (IBEET-FA) have limitations, particularly high computational costs associated with bilinear pairings.

Purpose of the Study:

  • To develop a novel and efficient identity-based encryption supporting equality test with flexible authorization (IBEET-FA) scheme.
  • To replace computationally expensive bilinear pairings with general trapdoor discrete logarithm groups.
  • To enhance data access control mechanisms in cloud storage.

Main Methods:

  • Construction of a new IBEET-FA scheme using general trapdoor discrete logarithm groups.
  • Comparative analysis of computational costs against existing schemes (Li et al.).
  • Security proofs for one-wayness under chosen identity and chosen ciphertext attacks (OW-ID-CCA) and indistinguishability against chosen identity and chosen ciphertext attacks (IND-ID-CCA).

Main Results:

  • The proposed IBEET-FA scheme demonstrates significantly reduced computational costs.
  • Encryption algorithm cost reduced to 43% compared to Li et al.'s scheme.
  • Type 2 and 3 authorization algorithms achieved a 40% reduction in computational cost compared to Li et al.'s scheme.

Conclusions:

  • The developed IBEET-FA scheme offers improved efficiency without compromising security.
  • This advancement provides a more practical solution for secure data access control in cloud environments.
  • The scheme is proven secure against standard cryptographic attack models (OW-ID-CCA and IND-ID-CCA).