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Guessing less and better: improved attacks on GIFT-64
Federico Canale1, María Naya-Plasencia2
1Horst Görtz Institute for IT Security, Ruhr University Bochum, Bochum, Germany.
Designs, Codes, and Cryptography
|March 20, 2025
Summary
Researchers improved a differential related-key attack on the GIFT-64 block cipher. New methods enhance key recovery complexity, offering two improved trade-offs for cryptanalysis.
Area of Science:
- Cryptography
- Computer Science
- Information Security
Background:
- GIFT-64 is a widely studied block cipher proposed in 2017.
- The most effective known attack is a differential related-key attack targeting 26 rounds.
Purpose of the Study:
- To enhance the key recovery complexity of the differential related-key attack on GIFT-64.
- To explore the application of generic frameworks for improving key recovery in cryptanalysis.
Main Methods:
- Studied the existing 26-round differential related-key attack.
- Applied recent generic frameworks for key recovery enhancement.
- Incorporated efficient parallel key guessing and list merging techniques for partial solutions.
Main Results:
- Achieved improved key recovery complexity for the attack.
- Proposed two distinct trade-offs resulting from the enhanced key recovery.
- Demonstrated the effectiveness of generic frameworks combined with specific optimization techniques.
Conclusions:
- The applied techniques significantly improve the complexity of the differential related-key attack on GIFT-64.
- The proposed methods offer practical advancements in cryptanalysis.
- These techniques are potentially applicable to improving other differential attacks on block ciphers.
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