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tema 3. criptografía simétrica: cifrado en bloque - CryptULL

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$ " #<br />

2) [ # ) 5<br />

2b 28 ab 09<br />

7e ae f7 cf<br />

15 d2 15 4f<br />

16 a6 88 3c<br />

W(0) W(1) W(2) W(3)<br />

W(0) = 2b 7e 15 16<br />

W(1) = 28 ae d2 a6<br />

W(2) = ab f7 15 88<br />

W(3) = 09 cf 4f 3c<br />

2) [ # ) I < $@ /;<br />

[ # I [ /;# 9 [ #<br />

[ # I [ ` # 9 [ ` #<br />

[ # I [ # 9 [ #<br />

$ [ # I - -<br />

28 ae d2 a6<br />

⊕ a0 fa fe 17<br />

88 54 2c b1<br />

a0 88 23 2a<br />

fa 54 a3 6c<br />

fe 2c 39 76<br />

17 b1 39 05<br />

' $ ) - < )<br />

- $ ) ) *<br />

) - < 3 5) ,<br />

- $ ) : , !3 0 5 0 A #<br />

Análisis de riesgos 34<br />

7<br />

7

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