Tweaks and keys for block ciphers: the {sc tweakey} framework. We propose the tweakey framework with goal to unify the design of tweakable block ciphers and of block ciphers resistant to related-key attacks. Our framework is simple, extends the key-alternating construction, and allows to build a primitive with arbitrary tweak and key sizes, given the public round permutation (for instance, the aes round). Increasing the sizes renders the security analysis very difficult and thus we identify a subclass of tweakey, that we name stk, which solves the size issue by the use of finite field multiplications on low hamming weight constants. Overall, this construction allows a significant increase of security of well-known authenticated encryptions mode like Θcb3 from birthday-bound security to full security, where a regular block cipher was used as a black box to build a tweakable block cipher. Our work can also be seen as advances on the topic of secure key schedule design.

References in zbMATH (referenced in 16 articles , 1 standard article )

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  1. Chang, Donghoon; Ghosh, Mohona; Gupta, Kishan Chand; Jati, Arpan; Kumar, Abhishek; Moon, Dukjae; Ray, Indranil Ghosh; Sanadhya, Somitra Kumar: SPF: a new family of efficient format-preserving encryption algorithms (2017)
  2. Dobraunig, Christoph; List, Eik: Impossible-differential and boomerang cryptanalysis of round-reduced Kiasu-BC (2017)
  3. Tolba, Mohamed; Abdelkhalek, Ahmed; Youssef, Amr M.: Impossible differential cryptanalysis of reduced-round SKINNY (2017)
  4. Zheng, Yafei; Wu, Wenling: Biclique attack of block cipher SKINNY (2017)
  5. Beierle, Christof; Jean, Jérémy; Kölbl, Stefan; Leander, Gregor; Moradi, Amir; Peyrin, Thomas; Sasaki, Yu; Sasdrich, Pascal; Sim, Siang Meng: The $ SKINNY$ family of block ciphers and its low-latency variant $ MANTIS$ (2016)
  6. Dobraunig, Christoph; Eichlseder, Maria; Korak, Thomas; Lomné, Victor; Mendel, Florian: Statistical fault attacks on nonce-based authenticated encryption schemes (2016)
  7. Dobraunig, Christoph; Eichlseder, Maria; Mendel, Florian: Square attack on 7-round Kiasu-BC (2016)
  8. Forler, Christian; List, Eik; Lucks, Stefan; Wenzel, Jakob: Efficient beyond-birthday-bound-secure deterministic authenticated encryption with minimal stretch (2016)
  9. Fouque, Pierre-Alain; Karpman, Pierre; Kirchner, Paul; Minaud, Brice: Efficient and provable white-box primitives (2016)
  10. Jean, Jérémy; Sasaki, Yu; Wang, Lei: Analysis of the CAESAR candidate silver (2016)
  11. Minematsu, Kazuhiko: Authenticated encryption with small stretch (or, how to accelerate AERO) (2016)
  12. Vizár, Damian: The state of the authenticated encryption (2016)
  13. Wang, Lei; Guo, Jian; Zhang, Guoyan; Zhao, Jingyuan; Gu, Dawu: How to build fully secure tweakable blockciphers from classical blockciphers (2016)
  14. Cogliati, Beno^ıt; Lampe, Rodolphe; Seurin, Yannick: Tweaking Even-Mansour ciphers (2015)
  15. Minematsu, Kazuhiko; Iwata, Tetsu: Tweak-length extension for tweakable blockciphers (2015)
  16. Jean, Jérémy; Nikolić, Ivica; Peyrin, Thomas: Tweaks and keys for block ciphers: the tweakey framework (2014)