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Cube attacks on round-reduced TinyJAMBU.

Wil Liam Teng1, Iftekhar Salam2, Wei-Chuen Yau1

  • 1School of Computing and Data Science, Xiamen University Malaysia, Sepang, 43900, Malaysia.

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|March 30, 2022
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Summary
This summary is machine-generated.

This study evaluates the TinyJAMBU lightweight cryptography cipher using cube attacks. TinyJAMBU demonstrates a stronger security margin against these attacks than its designers initially claimed.

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Area of Science:

  • Cryptography
  • Computer Science
  • Information Security

Background:

  • The proliferation of Internet of Things (IoT) devices necessitates lightweight cryptographic algorithms for resource-constrained environments.
  • The National Institute of Standards and Technology (NIST) initiated the Lightweight Cryptography (LWC) project to address this need.
  • TinyJAMBU is a cipher that emerged as a finalist in the NIST LWC project.

Purpose of the Study:

  • To evaluate the security of the TinyJAMBU cipher against cryptanalytic attacks.
  • To assess the effectiveness of cube attacks on the TinyJAMBU cipher's initialization and encryption phases.

Main Methods:

  • Cube attack methodology was employed to analyze TinyJAMBU.
  • Five distinguishing attacks (DA1-DA5) and two key recovery attacks (KRA1-KRA2) were designed and executed.
  • Attacks targeted both the initialization and encryption phases of the cipher.

Main Results:

  • Distinguishing attacks achieved an 18-bit cube distinguisher with 438 rounds.
  • Key recovery attacks were successful on variants with 428 rounds.
  • Further distinguishers (DA3-DA5) were demonstrated for up to 437 rounds using various input bits.

Conclusions:

  • TinyJAMBU exhibits a more robust security margin against cube attacks than originally stated by its designers.
  • The findings provide valuable insights into the security of lightweight ciphers for IoT applications.
  • Experimental validation confirmed the efficacy of the presented attacks.