References of "Leander, Gregor"
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See detailModeling for Three-Subset Division Property without Unknown Subset
Hao, Yonglin; Leander, Gregor; Meier, Willi et al

in Journal of Cryptology (2021), 34(3), 22

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See detailModeling for Three-Subset Division Property without Unknown Subset and Improved Cube Attacks
Hao, Yonglin; Leander, Gregor; Meier, Willi et al

in 39th Annual International Conference on the Theory and Applications of Cryptographic Techniques (EUROCRYPT 2020), Croatia 10-14 May 2020 (2020, January)

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See detailCRAFT: Lightweight Tweakable Block Cipher with Efficient Protection Against DFA Attacks
Beierle, Christof UL; Leander, Gregor; Moradi, Amir et al

in IACR Transactions on Symmetric Cryptology (2019), 2019(1), 5-45

Traditionally, countermeasures against physical attacks are integrated into the implementation of cryptographic primitives after the algorithms have been designed for achieving a certain level of ... [more ▼]

Traditionally, countermeasures against physical attacks are integrated into the implementation of cryptographic primitives after the algorithms have been designed for achieving a certain level of cryptanalytic security. This picture has been changed by the introduction of PICARO, ZORRO, and FIDES, where efficient protection against Side-Channel Analysis (SCA) attacks has been considered in their design. In this work we present the tweakable block cipher CRAFT: the efficient protection of its implementations against Differential Fault Analysis (DFA) attacks has been one of the main design criteria, while we provide strong bounds for its security in the related-tweak model. Considering the area footprint of round-based hardware implementations, CRAFT outperforms the other lightweight ciphers with the same state and key size. This holds not only for unprotected implementations but also when fault-detection facilities, side-channel protection, and their combination are integrated into the implementation. In addition to supporting a 64-bit tweak, CRAFT has the additional property that the circuit realizing the encryption can support the decryption functionality as well with very little area overhead. [less ▲]

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See detailNonlinear Approximations in Cryptanalysis Revisited
Beierle, Christof UL; Canteaut, Anne; Leander, Gregor

in IACR Transactions on Symmetric Cryptology (2018), 2018(4), 80-101

This work studies deterministic and non-deterministic nonlinear approximations for cryptanalysis of block ciphers and cryptographic permutations and embeds it into the well-understood framework of linear ... [more ▼]

This work studies deterministic and non-deterministic nonlinear approximations for cryptanalysis of block ciphers and cryptographic permutations and embeds it into the well-understood framework of linear cryptanalysis. For a deterministic (i.e., with correlation ±1) nonlinear approximation we show that in many cases, such a nonlinear approximation implies the existence of a highly-biased linear approximation. For non-deterministic nonlinear approximations, by transforming the cipher under consideration by conjugating each keyed instance with a fixed permutation, we are able to transfer many methods from linear cryptanalysis to the nonlinear case. Using this framework we in particular show that there exist ciphers for which some transformed versions are significantly weaker with regard to linear cryptanalysis than their original counterparts. [less ▲]

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