Cryptology ePrint Archive: Report 2021/007

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

Zi-Yuan Liu and Yi-Fan Tseng and 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.

Category / Keywords: public-key cryptography / Insider Keyword Guessing Attack, Outsider Keyword Guessing Attack, Lattices, Identity-based Encryption, Keyword Search

Date: received 1 Jan 2021

Contact author: zyliu at cs nccu edu tw

Available format(s): PDF | BibTeX Citation

Version: 20210102:114149 (All versions of this report)

Short URL: ia.cr/2021/007


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