Comment on “Expressive Public-Key Encryption With Keyword Search: Generic Construction From KP-ABE and an Efficient Scheme Over Prime-Order Groups”

Comment on “Expressive Public-Key Encryption With Keyword Search: Generic Construction From KP-ABE and an Efficient Scheme Over Prime-Order Groups”

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The public key encryption with keyword search (PEKS) scheme is a cryptographic safavieh couture furniture primitive that allows a cloud server to search for a ciphertext without knowing the corresponding keyword used in the search.An expressive PEKS scheme is a variant of the PEKS scheme that supports conjunctive and disjunctive searches (expressive search).Utilising the expressive properties of an attribute-based encryption (ABE) scheme, most of the expressive PEKS schemes can be constructed from an ABE scheme.

In this paper, we first give a brief review of the transformed expressive curash water wipes 6x80 PEKS scheme by Shen et al.in 2019.Then, we present a keyword guessing attack on Shen et al.

’s transformed expressive PEKS scheme and show that an adversary can correctly guess the supposedly hidden keyword.