Re: Using Java To Implement RSA Algorithm

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

http://i71.photobucket.com/albums/i140/carpinate/RSA.jpg
http://i71.photobucket.com/albums/i140/carpinate/RSA2.jpg

Ive done this so far:

package RSAalgorithm;

public class SecurityAlgorithm {

public static char[] StartSymbolic =

I'd name that variable "letters" or "symbols" rather than "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};


Since numeric[n] is always n there is no need for this array.




public static void main(String[] args) {


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

There is a convention that variable names should start with a lowercase letter. Please use those conventions when sharing code. Otherwise your variable names look like class names and are confusing.




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

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

If you are attempting to reproduce the "RSA2" table I don't see why you have two for loops, One should suffice. It would be clearer if you used variable names like p instead of counter or i.


int temp = numeric[counter];

Isn't this the same as
int temp = counter;

P3 = (long) (temp*temp*temp);

Which makes this
P3 = (long) (counter*counter*counter);

And if you used my suggestions for naming it would be
p3 = p*p*p;
which I would find clearer.
You don't need the the explicit cast to long.

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

int tp = counter;


C7mod33 = C7%33;
}


The indentation could be improved! Try configuring your editor or IDE to replace tabs with spaces (two or four)

System.out.println("*******************************************");
//System.out.println(StartSymbolic[i]);

Is it the line above that is causing you difficulty? What happens when you include it?

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]);

Shouldn't that be
System.out.println(StartSymbolic[C7mod33]);


System.out.println("*******************************************");

}

}
}




Output:
*******************************************
Numeric: 1
P3: 1
P3mod33: 1
C7: 1
C7mod33:1
*******************************************
*******************************************
Numeric: 2
P3: 8
P3mod33: 8
C7: 2097152
C7mod33:2
*******************************************

<snip>

*******************************************
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


That isn't RSA. That is seven separate RSA-like messages. That would be using RSA to produce a trivial substitution cipher.

Followup set to comp.lang.java.help since the problems are not with the GUI.
.