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Old October 27th, 2009, 05:29 PM
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Default Crypto question

I'm taking my first programming class, and we're using java. I've been getting the hang of everything so far, but functions are starting to leave me in the dust I think. I'm currently working on a project that is supposed to encrypt or decrypt a phrase, and I'm stuck.

I'm not sure how to convert a phrase the user inputs from the 'key' string (correct alphabet) to my 'alpha' string (jumbled alphabet). Can anyone help me out?

Here is the program so far:

Code:
import java.util.*;

public class Crypto {

  static Scanner input = new Scanner(System.in);
  static String alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  static String key = "UBWKOVGAPRFJLCQHZENSXDMYTI";
    
  public static void main(String[] args) {
    boolean keepGoing = true;
    while(keepGoing){

      String response = menu();

        if (response.equals("1")){
          System.out.println("Please enter unencrypted phrase");
          String plain = input.nextLine();
          plain = plain.toUpperCase();
          System.out.println(encrypt(plain));

        } else if (response.equals("2")){
          System.out.println("Please enter encrypted phrase");
          String code = input.nextLine();
          code = code.toUpperCase();
          System.out.println(decrypt(code));

        } else if (response.equals("0")){
          System.out.println("Goodbye!");
          keepGoing = false;

        } else {
          System.out.println("Sorry. I didn't understand");
        } // end if
        
      } // end while
    
   } // end main    
  
  public static String menu(){
	  System.out.println("Crypto Machine");
	  System.out.println("");
	  System.out.println("Please enter a selection.");
	  System.out.println("0) Quit");
	  System.out.println("1) Encrypt a phrase.");
	  System.out.println("2) Decrypt a phrase.");
	  String result = input.nextLine();
	  return result;
	  
  } //end menu
  
  public static String decrypt(){
	  
	  
  } //end decrypt


  public static String encrypt(){

	  
  } //end encrypt
  
} // end Crypto
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Old November 1st, 2009, 01:07 AM
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Default

check the following links, they have couple of examples, might give you a start

http://www.java-tips.org/java-se-tip...symmetric.html
http://security.ittoolbox.com/docume...-of-data-15198
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