Find the secret key for this function

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Find the secret key for this function

06-03-2016, 03:35

Syoma

reverse engineer

Join Date: May 2009

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Quote:

Originally Posted by Kerlingen

RSA is x^y with known x and unknown y.
This is x^y with unknown x and known y.
Two completely different things.

RSA powmod primitive is
c = m^e mod N, where c is ciphertext, m - message, e - public exponent, N - modulus
m = c^d mod N, where d is private exponent

our case is
0x90de757572b51cd3 = key^7 mod (max_uint64+1)

Last edited by Syoma; 06-03-2016 at 03:36. Reason: wrong summary

The Following 3 Users Say Thank You to Syoma For This Useful Post:
dila (06-03-2016), niculaita (06-03-2016)

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