2026-09-19T13:25:21Zhttps://iris.unitn.it/oai/request

oai:iris.unitn.it:11572/3685862026-04-03T00:51:04Zcom_11572_237821com_11572_101871col_11572_237822ou_ou00004

Differential attacks using alternative operations and block cipher design Civino, Roberto Civino, Roberto Sala, Massimiliano Settore MAT/02 - Algebra Block ciphers and their security are the main subjects of this work. In the first part it is described the impact of differential cryptanalysis, a powerful statistical attack against block ciphers, when operations different from the one used to perform the key addition are considered on the message space. It is proven that when an alternative difference operation is carefully designed, a cipher that is proved secure against classical differential cryptanalysis can instead be attacked using this alternative difference. In the second part it is presented a new design approach of round functions for block ciphers. The proposed round functions can give to the cipher a potentially better level of resistance against statistical attacks. It is also shown that the corresponding ciphers can be proven secure against a well-known algebraic attack, based on the action of the permutation group generated by the round functions of the cipher. 2018 info:eu-repo/semantics/doctoralThesis https://hdl.handle.net/11572/368586 http://dx.doi.org/10.15168/11572_368586 10.15168/11572_368586 eng firstpage:1 lastpage:129 numberofpages:129 info:eu-repo/semantics/closedAccess Università degli studi di Trento place:TRENTO license:Tutti i diritti riservati (All rights reserved) license:Tutti i diritti riservati (All rights reserved)