Welcome to the resource topic for 2021/007
Title:
Notes on a lattice-based proxy-oriented identity-based encryption with keyword search
Authors: Zi-Yuan Liu, Yi-Fan Tseng, Raylin Tso, Cheng-Yi Lee
Abstract:Zhang et al. recently proposed a lattice-based proxy-oriented identity-based encryption with keyword search (PO-IBEKS) at Information Sciences in 2019. They claimed that their scheme can resist insider keyword guessing attacks by preventing cloud server from generating ciphertext. In this note, we provide a cryptanalysis of their PO-IBEKS and demonstrate that their scheme cannot resist outsider/insider keyword guessing attacks, even though they satisfy unforgeability requirement. Furthermore, we uncover the root cause of the attack and provide a possible solution for Zhang et al.'s scheme to aid future designs of secure PO-IBEKS schemes.
ePrint: https://eprint.iacr.org/2021/007
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