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Weak-keys and key-recovery attack for [Formula: see text]
Pranjal Dutta1, Mahesh Sreekumar Rajasree2, Santanu Sarkar3
1Department of Computer Science, Chennai Mathematical Institute, Chennai, India.
Scientific Reports
|September 29, 2022
Summary
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
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.
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