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Prac7.cpp
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Prac7.cpp
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#include <iostream>
#include <math.h>
using namespace std;
int gcd(int a, int b)
{
int t;
while (1)
{
t = a % b;
if (t == 0)
return b;
a = b;
b = t;
}
}
int main()
{
double p;
double q;
cout << "Enter value of p : ";
cin >> p;
cout << "Enter value of q : ";
cin >> q;
double n = p * q;
double track;
double phi = (p - 1) * (q - 1);
double e;
cout << "Enter value of e : ";
cin >> e;
while (e < phi)
{
track = gcd(e, phi);
if (track == 1)
break;
else
e++;
}
double d1 = 1 / e;
double d = fmod(d1, phi);
double msg;
cout << "Enter value of msg : ";
cin >> msg;
double c = pow(msg, e);
double m = pow(c, d);
c = fmod(c, n);
m = fmod(m, n);
cout << "Original Message = " << msg << endl;
cout << "Encrypted message = " << c << endl;
cout << "Decrypted message = " << m << endl;
return 0;
}