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tema 3. criptografía simétrica: cifrado en bloque - CryptULL

tema 3. criptografía simétrica: cifrado en bloque - CryptULL

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. #<br />

( [ ) : *6 53<br />

5 , 0 5 53 < 5< )< # ( B<br />

2 5< )< < #,<br />

F 5 7 7 5 - . )- - )<br />

2b 28 ab 09<br />

7e ae f7 cf<br />

15 d2 15 4f<br />

16 a6 88 3c<br />

7e ae f7 cf<br />

15 d2 15 4f<br />

16 a6 88 3c<br />

2b 28 ab 09<br />

() ) () A# I ]( A#< Y Z< Y Z<<br />

Y Z^ 5 3 ( A# $ ? #<br />

) 9 A ,<br />

$ " #<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 . )- - )<br />

$ ← ( [ $ # I )- ) ) .<br />

$ ← !3 0 5 $ # I 5<br />

() D # I () #_ A I 9 A I 9 I<br />

() # I ] < < < ^<br />

a0 88 23 2a<br />

$ ← ()<br />

[ # I [ # 9<br />

# 9<br />

$<br />

$ I 5 5 fa 54 # a3 6c<br />

fe 2c 39 76<br />

2b 7e 15 16<br />

⊕ 8b 84 eb 01<br />

17 b1 39 05<br />

a0 fa fe 17<br />

Análisis de riesgos 33<br />

7<br />

77

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