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Type-preserving Matrices and Block Cipher Security Okediran, Tunmbi Olayemi ; Kureš, Miroslav (referee) ; Aragona, Riccardo (advisor) Zavedli jsme novou vlastnost směšovacích vrstev blokových šifer. Tato vlastnost se nazývá non-type-preserving a zaručuje odolnost vůči algebraickým útokům na základě imprimitivity skupiny generované kruhovými funkcemi. Uvažovali jsme binární matici odpovídající směšovací vrstvě a dali jsme potřebné a dostatečné podmínky pro binární matici, která zajišťuje typ nezachovávající vlastnost. Pak jsme ukázali, že některé reálné šifry splňují tyto nezbytné a postačující podmínky, a proto jsou typ nezachovávající. Uvažované šifry byly GOST, PRESENT a AES. Nakonec jsme v kapitole 4 ukázali, že pokud míchací vrstva šifry SPN, která používá adiční modulo 2^n pro míchání klíčů, nezachovává typ, pak je skupina generovaná funkcí round primitivní. Detailed record

Type-preserving Matrices and Block Cipher Security Okediran, Tunmbi Olayemi ; Kureš, Miroslav (referee) ; Aragona, Riccardo (advisor) Zavedli jsme novou vlastnost směšovacích vrstev blokových šifer. Tato vlastnost se nazývá non-type-preserving a zaručuje odolnost vůči algebraickým útokům na základě imprimitivity skupiny generované kruhovými funkcemi. Uvažovali jsme binární matici odpovídající směšovací vrstvě a dali jsme potřebné a dostatečné podmínky pro binární matici, která zajišťuje typ nezachovávající vlastnost. Pak jsme ukázali, že některé reálné šifry splňují tyto nezbytné a postačující podmínky, a proto jsou typ nezachovávající. Uvažované šifry byly GOST, PRESENT a AES. Nakonec jsme v kapitole 4 ukázali, že pokud míchací vrstva šifry SPN, která používá adiční modulo 2^n pro míchání klíčů, nezachovává typ, pak je skupina generovaná funkcí round primitivní. Detailed record

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