Notes on a lattice-based proxy-oriented identity-based encryption with keyword search

Zi-Yuan Liu; Yi-Fan Tseng; Raylin Tso; Cheng-Yi Lee

Paper 2021/007

Notes on a lattice-based proxy-oriented identity-based encryption with keyword search

Zi-Yuan Liu, Yi-Fan Tseng, Raylin Tso, and 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.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint. MINOR revision.
Keywords: Insider Keyword Guessing Attack Outsider Keyword Guessing Attack Lattices Identity-based Encryption Keyword Search
Contact author(s): zyliu @ cs nccu edu tw
History: 2021-01-02: received
Short URL: https://ia.cr/2021/007
License: CC BY

BibTeX

@misc{cryptoeprint:2021/007,
      author = {Zi-Yuan Liu and Yi-Fan Tseng and Raylin Tso and Cheng-Yi Lee},
      title = {Notes on a lattice-based proxy-oriented identity-based encryption with keyword search},
      howpublished = {Cryptology ePrint Archive, Paper 2021/007},
      year = {2021},
      note = {\url{https://eprint.iacr.org/2021/007}},
      url = {https://eprint.iacr.org/2021/007}
}