Finding N̷e̷m̷o̷ Prime Numbers

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RSA gains its key security strength from the multiplication of two prime numbers (p and q) to get N. If we get p and q, then we can work out:

Phi = (p-1)(q-1)

And since we have encryption key (e), and which is normally 65,537, we solve for d in:

d x e mod (PHI) = 1

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Prof Bill Buchanan OBE FRSE
ASecuritySite: When Bob Met Alice

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. Based in Edinburgh. Old World Breaker. New World Creator. Building trust.