Using Java To Implement RSA Algorithm

Floetic · March 21st, 2008, 07:24 PM

Hi I'm looking for SOME advice on how to simulate the following:

http://i71.photobucket.com/albums/i1...pinate/RSA.jpg

http://i71.photobucket.com/albums/i1...inate/RSA2.jpg

Ive done this so far:

Code:

package RSAalgorithm;

public class SecurityAlgorithm {

     public static char[] StartSymbolic = {'A','B','C','D','E','F','G','H','I','J',
                                    'K','L','M','N','O','P','Q','R','S','T',
                                    'U','V','W','X','Y','Z'}; 

     public static int[] numeric = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
                          16,17,18,19,20,21,22,23,24,25,26};


 

     public static void main(String[] args) {


          long P3 = 0;
          long P3mod33=0;
          long C7=0;
           long C7mod33=0;



       for(int counter = 0; counter < numeric.length; counter++){

            for(int i = 0; i < StartSymbolic.length; i++)  {

              int temp = numeric[counter];
              P3 = (long) (temp*temp*temp);
         P3mod33 = P3%33;
         C7 = (long) (P3mod33*P3mod33*P3mod33*P3mod33*P3mod33*P3mod33*P3mod33);
        int tp = numeric[counter];
                 C7mod33 = C7%33;
       }

                    System.out.println("*******************************************");
                     //System.out.println(StartSymbolic[i]);
                    System.out.println("Numeric: " + numeric[counter]); 
                         System.out.println("P3: " +P3); 
                     System.out.println("P3mod33: " + P3mod33); 
                      System.out.println("C7: " +C7);
                      System.out.println("C7mod33:" + C7mod33);
                    //  System.out.println(StartSymbolic[i]);
                     System.out.println("*******************************************");

          }

     }
 }

Code:

Output:
*******************************************
Numeric: 1
P3: 1
P3mod33: 1
C7: 1
C7mod33:1
*******************************************
*******************************************
Numeric: 2
P3: 8
P3mod33: 8
C7: 2097152
C7mod33:2
*******************************************
*******************************************
Numeric: 3
P3: 27
P3mod33: 27
C7: 10460353203
C7mod33:3
*******************************************
*******************************************
Numeric: 4
P3: 64
P3mod33: 31
C7: 27512614111
C7mod33:4
*******************************************
*******************************************
Numeric: 5
P3: 125
P3mod33: 26
C7: 8031810176
C7mod33:5
*******************************************
*******************************************
Numeric: 6
P3: 216
P3mod33: 18
C7: 612220032
C7mod33:6
*******************************************
*******************************************
Numeric: 7
P3: 343
P3mod33: 13
C7: 62748517
C7mod33:7
*******************************************
*******************************************
Numeric: 8
P3: 512
P3mod33: 17
C7: 410338673
C7mod33:8
*******************************************
*******************************************
Numeric: 9
P3: 729
P3mod33: 3
C7: 2187
C7mod33:9
*******************************************
*******************************************
Numeric: 10
P3: 1000
P3mod33: 10
C7: 10000000
C7mod33:10
*******************************************
*******************************************
Numeric: 11
P3: 1331
P3mod33: 11
C7: 19487171
C7mod33:11
*******************************************
*******************************************
Numeric: 12
P3: 1728
P3mod33: 12
C7: 35831808
C7mod33:12
*******************************************
*******************************************
Numeric: 13
P3: 2197
P3mod33: 19
C7: 893871739
C7mod33:13
*******************************************
*******************************************
Numeric: 14
P3: 2744
P3mod33: 5
C7: 78125
C7mod33:14
*******************************************
*******************************************
Numeric: 15
P3: 3375
P3mod33: 9
C7: 4782969
C7mod33:15
*******************************************
*******************************************
Numeric: 16
P3: 4096
P3mod33: 4
C7: 16384
C7mod33:16
*******************************************
*******************************************
Numeric: 17
P3: 4913
P3mod33: 29
C7: 17249876309
C7mod33:17
*******************************************
*******************************************
Numeric: 18
P3: 5832
P3mod33: 24
C7: 4586471424
C7mod33:18
*******************************************
*******************************************
Numeric: 19
P3: 6859
P3mod33: 28
C7: 13492928512
C7mod33:19
*******************************************
*******************************************
Numeric: 20
P3: 8000
P3mod33: 14
C7: 105413504
C7mod33:20
*******************************************
*******************************************
Numeric: 21
P3: 9261
P3mod33: 21
C7: 1801088541
C7mod33:21
*******************************************
*******************************************
Numeric: 22
P3: 10648
P3mod33: 22
C7: 2494357888
C7mod33:22
*******************************************
*******************************************
Numeric: 23
P3: 12167
P3mod33: 23
C7: 3404825447
C7mod33:23
*******************************************
*******************************************
Numeric: 24
P3: 13824
P3mod33: 30
C7: 21870000000
C7mod33:24
*******************************************
*******************************************
Numeric: 25
P3: 15625
P3mod33: 16
C7: 268435456
C7mod33:25
*******************************************
*******************************************
Numeric: 26
P3: 17576
P3mod33: 20
C7: 1280000000
C7mod33:26
*******************************************

I was looking to achieve what is shown in the 1st image.

I can get the numeric, P3, P3mod33, C7, C7mod33 to print out but not the symbolic information for some reason?

I want to be able to allow the user to enter in a string then the plaintext and ciphertext can be displayed.

Like this:

String input: SUZANNE

Output:

Plaintext: S U Z A N N E
Ciphertext: 28 21 20 1 5 5 26

Thanks.

iamrakesh22 · March 24th, 2008, 07:26 AM

If i understood your problem clearly then the following code will give the output you wanted

Code:

import java.io.*;

public class SecurityAlgorithm {

    public static DataInputStream in = new DataInputStream(System.in);

     public static void main(String[] args) {
         char[] plainText;
         try {
             System.out.print("Enter a string: ");
             plainText = in.readLine().toUpperCase().toCharArray();
         } catch (IOException e) {
             e.printStackTrace();
             return;
         }

         int[] encText = new int[plainText.length];

         System.out.print("\nPlain Text:\t ");
         for(int i=0;i<plainText.length; i++) {
             int tmp =(int)plainText[i]-64;
             encText[i] = (tmp*tmp*tmp)%33;
             System.out.print("\t"+plainText[i]);
         }

         System.out.print("\nEncripted Text:\t");
         for(int i=0;i<encText.length; i++) {
             System.out.print("\t"+encText[i]);
         }
     }
 }

- Rakesh

Floetic · March 24th, 2008, 12:07 PM

Thank you so so very much rakesh that is exactly what I was looking to achieve :)