インターネット概論 第07回(2004/11/12) 「SFC-CNSの現状」

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14 AES 128bit) 196bit 256bit 128bit) bit) bit)

15

16 (n, e) (n, d) M M : 2 ( 101 5) [e ] [e ] n = p * q (p q ) (n) = (p-1)(q-1) gcd( (n), e) = 1; 1 < e < (n) d = e^-1 (mod (n)) M e (mod n) [d ] [d ] C C : M = C d (mod n) = (M^e ^d (mod n) = M^ed (mod n) = M (mod n)

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20 ( ) A A B B OK

21 MD

22 1 MD?? MD 1.? 2. 3.??? 4.

23 (1) challenge( (2) (3) response (4)

24 N Pass Phrase k Pass Phrase N+1 Pass Phrase k-1 Pass Phrase

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26 3 2 1

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