Develop a program for simple RSA algorithm to encrypt and decrypt the data.
import java.util.*;
import java.math.BigInteger;
import java.lang.*;
public class RSA {
public static void main(String[] args)
{
Scanner scan = new Scanner(System.in);
Random rand1=new Random(System.currentTimeMillis());
Random rand2=new Random(System.currentTimeMillis()*10);
System.out.println("Enter the Public Key:");
int pubkey=scan.nextInt();
BigInteger bigB_p=BigInteger.probablePrime(32, rand1);
BigInteger bigB_q=BigInteger.probablePrime(32, rand2);
BigInteger bigB_n=bigB_p.multiply(bigB_q);
BigInteger bigB_p_1=bigB_p.subtract(new BigInteger("1"));
BigInteger bigB_q_1=bigB_q.subtract(new BigInteger("1"));
BigInteger bigB_p_1_q_1=bigB_p_1.multiply(bigB_q_1);
while(true)
{
BigInteger BigB_GCD=bigB_p_1_q_1.gcd(new BigInteger(""+pubkey));
if(BigB_GCD.equals(BigInteger.ONE))
{
break;
}
pubkey++;
}
BigInteger bigB_pubkey=new BigInteger(""+pubkey);
BigInteger bigB_prvkey=bigB_pubkey.modInverse(bigB_p_1_q_1);
System.out.println("public key : "+bigB_pubkey);
System.out.println("private key : "+bigB_prvkey);
System.out.println("n : "+bigB_n);
System.out.println("Enter The plain text:");
BigInteger bigB_val=scan.nextBigInteger();
BigInteger bigB_cipherVal=bigB_val.modPow(bigB_pubkey,bigB_n);
System.out.println("Cipher text: " + bigB_cipherVal);
BigInteger bigB_plainVal=bigB_cipherVal.modPow(bigB_prvkey,bigB_n);
int plainVal=bigB_plainVal.intValue();
System.out.println("Plain text:" + plainVal);
