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Weak-keys and key-recovery attack for [Formula: see text].

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Researchers found weaknesses in the TinyJAMBU cipher, developing distinguishers for up to 476 rounds. They also established security bounds for the nonce-based feedback polynomial, enhancing understanding of TinyJAMBU

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Area of Science:

  • Cryptography
  • Computer Science
  • Information Security

Background:

  • The paper analyzes the NIST lightweight cryptography candidate, TinyJAMBU.
  • TinyJAMBU's core is a keyed permutation based on a non-linear feedback shift register.

Purpose of the Study:

  • To find distinguishers for TinyJAMBU in the weak-key setting.
  • To determine the security of TinyJAMBU against specific types of distinguishers.
  • To present new key-recovery attacks on TinyJAMBU.

Main Methods:

  • Analysis of the keyed permutation [Formula: see text] to identify useful cubes.
  • Investigation of the feedback polynomial's degree in nonce variables.
  • Application of monomial trail concepts for key-recovery attacks.

Main Results:

  • Developed distinguishers effective for up to 476 rounds in the weak-key setting, outperforming prior work.
  • Established that TinyJAMBU with over 445 rounds is secure against 32-sized cube distinguishers in the normal setting.
  • Presented new key-recovery attacks, though unlikely to compromise the full 640-round cipher.

Conclusions:

  • The developed distinguishers provide significant insights into TinyJAMBU's security limitations.
  • The analysis of the feedback polynomial confirms the cipher's resilience against certain attacks.
  • New attacks offer a deeper understanding of TinyJAMBU's cryptographic properties.