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초록
영어
SMS4 is a 128-bit block cipher with a 128-bit user key and 32 rounds, which is used in WAPI, the Chinese WLAN (Wireless Local Area Networks) national standard. The SMS4 cipher is suitable for pro- tections of pervasive computing systems especially where they require fast software implementations. This is due to the fact that SMS4 only uses simple operations like XORs and bitwise rotations, and look-up tables which are all very fast in software. In this paper, we present a boomerang attack on a 18-round reduced SMS4. The methods presented to attack SMS4 can be applied to other unbalanced Feistel ciphers with incomplete diffusion.
목차
Abstract
1. Introduction
2. Preliminaries
2.1 Notation
2.2 Description of the SMS4 block cipher
2.3 The Boomerang Attack
3. Boomerang Attack on 18-Round SMS4
3.1 15-round boomerang and rectangle distinguishers of SMS4
3.2 Extension to a 16-round boomerang distinguisher of SMS4
3.3 Boomerang attack procedure
4. Conclusion
References
1. Introduction
2. Preliminaries
2.1 Notation
2.2 Description of the SMS4 block cipher
2.3 The Boomerang Attack
3. Boomerang Attack on 18-Round SMS4
3.1 15-round boomerang and rectangle distinguishers of SMS4
3.2 Extension to a 16-round boomerang distinguisher of SMS4
3.3 Boomerang attack procedure
4. Conclusion
References
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