computer security

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#include<stdio.h> #include<math.h> int gcd(int a, int h) { int temp; while (1) { temp = a%h; if (temp == 0) return h; a = h; h = temp; } } int main() { double p = 3; double q = 7; double n = p*q; double e = 2; double phi = (p-1)*(q-1); while (e < phi) { if (gcd(e, phi)==1) break; else e++; } int k = 2; double d = (1 + (k*phi))/e; double msg = 20; printf("Message data = %lf", msg); double c = pow(msg, e); c = fmod(c, n); printf("\nEncrypted data = %lf", c); double m = pow(c, d); m = fmod(m, n); printf("\nOriginal Message Sent = %lf", m); return 0; }

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