Ch 1 Numbers Flashcards

1
Q

Hvad består RSA af

A

p,q er store primtal. e,d udregnet fra p og q. N som er = pq.

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2
Q

Hvordan krypteres med RSA

A

c = [m]^e

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3
Q

Hvordan dekrypteres RSA

A

m = [c]^e

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4
Q

Hvordan ser formlen for unik reminder ud (1.2.1)

A

x = qd + r. For heltal d > 0. Findes r \in N med, q \in Z og 0 < d

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5
Q

Hvad betyder notationen c | a (1.2.2)

A

c deler a et uden remainder (heltallig).

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6
Q

hvad betyder a === b (mod c) (1.3.1)

A

Congruent modulo. Ses som to ting 1) c deler b-a (dvs uden remainder) 2) [a]_c = [b]_c (de har samme remainder)

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7
Q

p \in N er primtal hvis

A

p != 1, p, 1 er eneste divisor i p P = {2, 3, 7, 11, 13, 17, 19, 23, 29, 31, 37}

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8
Q

div(n)

A

div(n) = {d \in N : d | n}. Alle naturlige tal, som går i op i n.

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9
Q

Omskriv til brøk

A
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10
Q
A
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11
Q
A
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