Reflection Ciphers (Extended abstract) - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Conference Papers Year : 2015

Reflection Ciphers (Extended abstract)

Abstract

This paper investigates ciphers where the set of encryption functions is identical to the set of decryption functions, which we call reflection ciphers. Equivalently, there exists a permutation P , named the coupling permutation, such that decryption under k corresponds to en-cryption under P (k). We show that this coupling permutation must be an involution without fixed points. Special care has to be taken of some related-key distinguishers since, in the context of reflection ciphers, they may provide attacks in the single-key setting. We then derive some criteria for constructing secure reflection ciphers and analyze the security properties of different families of coupling permutations. In particular, we show that, for affine coupling permutations, the resistance to related-key distinguishers is given by some trade-off between the dimension and the covering-radius of some linear codes. Finally, as an illustration, we provide new variants of the block cipher PRINCE with key schedules corresponding to several coupling permutations.
Fichier principal
Vignette du fichier
wcc.pdf (366.24 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01237291 , version 1 (03-12-2015)

Identifiers

  • HAL Id : hal-01237291 , version 1

Cite

Christina Boura, Anne Canteaut, Lars R. Knudsen, Gregor Leander. Reflection Ciphers (Extended abstract). Workshop on Coding and Cryptography - WCC 2015, Apr 2015, Paris, France. ⟨hal-01237291⟩
124 View
75 Download

Share

Gmail Facebook X LinkedIn More