Cryptanalysis of An Identity-Based Encryption Scheme with Equality Test and Improvement


For several years, Cloud Computing privacy has been a source of concern. One of the major concepts in this area is public key encryption with equality tests as a variation of keyword searchable encryption. Wu et al. proposed an identity-based encryption with equality test in order to simplify certificate administration and optimize the system. When we study the most feasible definitions of the binary operations in the scheme, we find that some binary operations of the encryption in the scheme are not obvious, implying that the scheme is not more efficient than existing schemes or that the scheme's test is not available. Finally, we refine the scheme, and our refined scheme is also fine-grained.

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