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In the present paper, we implement a message recovery attack on the NTRU-HPS cryptosystem using its state-of-the-art parameters. We assume the knowledge of at most 2 bits of each coefficient of an unknown polynomial u(x). Then, using Babai’s nearest plane algorithm, we successfully recover the message. Additionally, we discuss the possibility of a side-channel attack method designed to extract the necessary bit information from the cryptographic operations.

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Towards Message Recovery in NTRU Encryption with Auxiliary Data

  • 会议论文

  • 发表日期：

    2025年

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  • Marios Adamoudis,
  • Konstantinos A. Draziotis,
  • Eirini Poimenidou

摘要

In the present paper, we implement a message recovery attack on the NTRU-HPS cryptosystem using its state-of-the-art parameters. We assume the knowledge of at most 2 bits of each coefficient of an unknown polynomial u(x). Then, using Babai’s nearest plane algorithm, we successfully recover the message. Additionally, we discuss the possibility of a side-channel attack method designed to extract the necessary bit information from the cryptographic operations.