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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

L i-1 L i = R i-1 One

L i-1 L i = R i-1 One round Feistel ciphers R i-1 f K i R i = L i-1 � f(R i-1, K i) 226

L i-1 L i = R i-1 Decryption Why does decryption work? Encryption round i Decryption round i R i-1 f K i R i=L i-1�f(R i-1, K i) R i=L i-1�f(R i-1, K i) L i = R i-1 R i-1 trivial L i-1 � f(R i-1, K i) � f( L i , K i) = L i-1 � f(L i, K i) � f( L i , K i) = L i-1 f K i L i-1 replace R i -1 by L i 227

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