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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		BigInteger c = null;
		BigInteger d = null;
		BigInteger phi = null;
		BigInteger e =null;
		BigInteger m = null;
 
		Scanner sc=new Scanner(System.in);
		System.out.print("Enter keysize(default = 1024):");
 
		try{
			String key=sc.next();
			bitLength = Integer.parseInt(key);
		}catch(NoSuckElementExveption exp){
			bitLength = KEYSIZE_EDFAULT;
		}catch(NumberFormatException exp){
			System.out.println("Wrong key size! Using default.");
		}
 
		SecureRandom scrRnd = new SecureRandom();
		do{
			pPrime = BigInteger.probablePrime(bitLength,scrRnd);
		}while (pPrime.bitLength()<bitLength);
		do{
			qPrime = BigInteger.probablePrime(bitLength,scrRnd);
		}while (qPrime.bitLength()<bitLength);
 
		System.out.println("p = "+pPrime);
		System.out.println("q = "+qPrime);
 
		BigInteger n = pPrime.multiply(qPrime);
		System.out.println("n = "+n);
 
		phi=pPrime.subtrcat(BigInteger.ONE).multiply(qPrime.subtract(BigInteger.ONE));
		System.out.println("phi = "+phi);
 
		do{
			do{
				e=BigInteger.probablePrime(bitLength,scrRnd);
			}while((e.bitLength()<bitLength) || (e.compareTo(phi)>=0));
		}while(phi.remainder(e).intValue()==0);
		System.out.println("e = "+e);
 
		d=e.modInverse(phi);
		System.out.println("d = "+d);
 
		System.out.println("Public Key{n,e}={"+n+","+e+"}");
		System.out.println("Private Key{n,d}={"+n+","+d+"}");
 
		System.out.println("Enter Encrypting value: ");
		m=new BigInteger(sc.next());
		c=m.modPow(e,n);
		System.out.println("Ciphertext value = "+c);
		System.out.println("Decrypting value...");
		BigInteger.plaintext = c.modPow(d,n);
		System.out.println("Plaintext value="+plaintext);
 
	}
}

Main.java:24: error: cannot find symbol
			bitLength = Integer.parseInt(key);
			^
  symbol:   variable bitLength
  location: class Ideone
Main.java:25: error: cannot find symbol
		}catch(NoSuckElementExveption exp){
		       ^
  symbol:   class NoSuckElementExveption
  location: class Ideone
Main.java:26: error: cannot find symbol
			bitLength = KEYSIZE_EDFAULT;
			^
  symbol:   variable bitLength
  location: class Ideone
Main.java:26: error: cannot find symbol
			bitLength = KEYSIZE_EDFAULT;
			            ^
  symbol:   variable KEYSIZE_EDFAULT
  location: class Ideone
Main.java:31: error: cannot find symbol
		SecureRandom scrRnd = new SecureRandom();
		^
  symbol:   class SecureRandom
  location: class Ideone
Main.java:31: error: cannot find symbol
		SecureRandom scrRnd = new SecureRandom();
		                          ^
  symbol:   class SecureRandom
  location: class Ideone
Main.java:33: error: cannot find symbol
			pPrime = BigInteger.probablePrime(bitLength,scrRnd);
			^
  symbol:   variable pPrime
  location: class Ideone
Main.java:33: error: cannot find symbol
			pPrime = BigInteger.probablePrime(bitLength,scrRnd);
			                                  ^
  symbol:   variable bitLength
  location: class Ideone
Main.java:34: error: cannot find symbol
		}while (pPrime.bitLength()<bitLength);
		        ^
  symbol:   variable pPrime
  location: class Ideone
Main.java:34: error: cannot find symbol
		}while (pPrime.bitLength()<bitLength);
		                           ^
  symbol:   variable bitLength
  location: class Ideone
Main.java:36: error: cannot find symbol
			qPrime = BigInteger.probablePrime(bitLength,scrRnd);
			^
  symbol:   variable qPrime
  location: class Ideone
Main.java:36: error: cannot find symbol
			qPrime = BigInteger.probablePrime(bitLength,scrRnd);
			                                  ^
  symbol:   variable bitLength
  location: class Ideone
Main.java:37: error: cannot find symbol
		}while (qPrime.bitLength()<bitLength);
		        ^
  symbol:   variable qPrime
  location: class Ideone
Main.java:37: error: cannot find symbol
		}while (qPrime.bitLength()<bitLength);
		                           ^
  symbol:   variable bitLength
  location: class Ideone
Main.java:39: error: cannot find symbol
		System.out.println("p = "+pPrime);
		                          ^
  symbol:   variable pPrime
  location: class Ideone
Main.java:40: error: cannot find symbol
		System.out.println("q = "+qPrime);
		                          ^
  symbol:   variable qPrime
  location: class Ideone
Main.java:42: error: cannot find symbol
		BigInteger n = pPrime.multiply(qPrime);
		                               ^
  symbol:   variable qPrime
  location: class Ideone
Main.java:42: error: cannot find symbol
		BigInteger n = pPrime.multiply(qPrime);
		               ^
  symbol:   variable pPrime
  location: class Ideone
Main.java:45: error: cannot find symbol
		phi=pPrime.subtrcat(BigInteger.ONE).multiply(qPrime.subtract(BigInteger.ONE));
		                                             ^
  symbol:   variable qPrime
  location: class Ideone
Main.java:45: error: cannot find symbol
		phi=pPrime.subtrcat(BigInteger.ONE).multiply(qPrime.subtract(BigInteger.ONE));
		    ^
  symbol:   variable pPrime
  location: class Ideone
Main.java:50: error: cannot find symbol
				e=BigInteger.probablePrime(bitLength,scrRnd);
				                           ^
  symbol:   variable bitLength
  location: class Ideone
Main.java:51: error: cannot find symbol
			}while((e.bitLength()<bitLength) || (e.compareTo(phi)>=0));
			                      ^
  symbol:   variable bitLength
  location: class Ideone
Main.java:66: error: cannot find symbol
		BigInteger.plaintext = c.modPow(d,n);
		          ^
  symbol:   variable plaintext
  location: class BigInteger
Main.java:67: error: cannot find symbol
		System.out.println("Plaintext value="+plaintext);
		                                      ^
  symbol:   variable plaintext
  location: class Ideone
24 errors

Standard output is empty