Hi i am trying to set up an RSA cryptosystem i have all the values except d selected prime numbers: p=1889
, q=2003
, n=3783667
, phi=3779776
, e= 61
i got stuck finding d could anyone help me to figure it out?
Setting up an RSA cryptosystem
- Two large distinct prime numbers
p
andq
are selected, andn = pq
andΦ(n) = (p − 1)(q − 1)
are calculated. An integer
e
is selected such thatgcd(Φ(n), e) = 1
and the multiplicative inversed = e^(−1)
inZΦ(n)
is calculated, i.e.ed ≡ 1 (mod Φ(n)).
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The numbers
p
,q
, andΦ(n)
, are then discarded. - The pair
(e, n)
is published as the public encryption key - The number
d
is the secret decryption key.
Here's the algo, step by step, including finding d.
m from the article is your Φ(n).
Now, you try to find a d = (1 + nm) / e, working through values of n until an integer solution for e is found.
Edit: Here you'll find a more detailed explanation of the whole algorithm.
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