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Title:
Towards a Characterization of the Related-Key Attack Security of the Iterated Even-Mansour Cipher
Authors: Dana Dachman-Soled, Angela Park, Ben San Nicolas
Abstract:We prove the related-key security of the Iterated Even-Mansour cipher under broad classes of related key derivation (RKD) functions. Our result extends the classes of RKD functions considered by Farshim and Procter (FSE, 15). Moreover, we present a far simpler proof which uses techniques similar to those used by Cogliati and Seurin (EUROCRYPT, 15) in their proof that the four-round Even-Mansour cipher is secure against XOR related-key attacks—a special case of our result and the result of Farshim and Proctor. Finally, we give a concrete example of a class of RKD functions covered by our result which does not satisfy the requirements given by Farshim and Procter and prove that the three-round Even-Mansour cipher is secure against this class of RKD functions.
ePrint: https://eprint.iacr.org/2016/707
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