how to decipher a piece of text message using java?

[nishanthan]

HERE IS THE CODE >>LET ME C IF U COULD DECrypT it


STPXBVMETPMSLGTPUBTPFBPROCUVMCUGTPZBVOTPROBVQTPBPTPIGSPRTPCIMGTPUBTPEGFOZQUTPUJSATPNGAACRGTPTPZBVTPQGBQMGTPJCWGTPAVFFGAAHVMMZTPQCAAGETPUJSATPAVNNCUSWGTPTPZBVTPAJBVMETPIGTPQOBVETPUJCUTPZBVTPRBTPUJSATPHCOTPTPWGOZTPSNQOGAASWGTPTPSTPXSAJTPZBVTPCMMTPUJGTPIGAU

[Clayton]

errr... no?

is this something you need help on?

if so, there are many topics about encryption and decryption around the site, search around for them.
if you do need help, post up a portion of the code you've tried and we'll see if we can't help you.

[TheFerret]

Do your own damned work and don't rely on the forum members to do it...

[Dan]

If you where meant to decrypt it, it is probly just a simple Shift Cipher or Substitution Cipher. However if this is for a corse on encription and is more advaced it could also be a Permutation Cipher, Hill Cipher, ect.

In the case of shift or subsitiution you can do a simple statical anyasic of the cipher text based on the english langue or simple try random keys if it is just a shift cipher.

It whould help to know what kind of cipher is being used as that will make it much easer to find a way to atack it.

Just looking at it shows you that the text is only A-Z and there are no spaces. This should give you an idea of the keyspace.

[nishanthan]

yo man...i tried ...i just can't figure it out...if u want i could show u wat i did so far...so yea

[nishanthan]

here this is all i did so far..

import java.io.*;

public class CryptoQ2
{
public static void main (String[] args) throws IOException
{
BufferedReader br = new BufferedReader (new FileReader ("message.txt"));
BufferedReader in = new BufferedReader (new InputStreamReader (System.in));
String alph = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String keyword = null;
String msgtxt = br.readLine ();

System.out.println ("Please input the keyword");
keyword = in.readLine ();
keyword = keyword.toUpperCase ();
System.out.println (msgtxt);

alph = scrambled_text (keyword, alph);
System.out.println (alph);

msgtxt = decryption (alph, msgtxt);

msgtxt = message_unparser (msgtxt);
System.out.println (msgtxt);
}


public static String scrambled_text (String key, String alphabet)
{
// Write code to create the scrambled alpha here
// 'key' is the keyword that will be used to create the new scrambled alphabet - 'Degrobois' will be used in this case
// 'alphabet' is the unscrambled alphabet from A to Z that needs to be scrambled

//int a = key.length();
String newkey = key + alphabet;
//int b = newkey.length();

for (int i=0; i<newkey.length(); i++)
{
for (int x=i+1; x<newkey.length(); x++)
{
if (newkey.charAt(i) == newkey.charAt(x))
{

newkey = (newkey.substring(0, x) + newkey.substring(x+1));



}

}
}



return newkey;

}


public static String decryption (String key, String message)
{
// Write code to decrypt the message based on the provided key - the new alphabet based on the keyword 'Degrobois'
// 'key' is the scrambled alphabet, and 'message' is the encrypted message


return message;
}


public static String message_unparser (String message)
{
//This method replaces the letter combination QN was a blank space. QN was the combination chosen to represent a blank space.
//This method does not need to be altered.

message = message.replaceAll ("QNQN", ". ");
message = message.replaceAll ("QN", " ");
message = message + '.';
return message;
}
}

[Dan]

nishanthan @ 22nd January 2007, 4:35 pm wrote:

yo man...i tried ...i just can't figure it out...if u want i could show u wat i did so far...so yea

That whould be helpfull, also if you told us more about the problem. Like is this home work, some thing you found on a site some where, ect....

[ericfourfour]

Here, I reformatted your code. You should try to stick to Java coding conventions (I think there is a link in the tutorials section somewhere). This will make programming a lot more understandable for you and others.

Java:

import java.io.*; public class CryptoQ2 {     public static void main (String[] args) throws IOException {         BufferedReader br = new BufferedReader (new FileReader ("message.txt"));         BufferedReader in = new BufferedReader (new InputStreamReader (System.in));         String alph = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";         String keyword = null;         String msgtxt = br.readLine ();                 System.out.println ("Please input the keyword");         keyword = in.readLine ();         keyword = keyword.toUpperCase ();         System.out.println (msgtxt);                 alph = scrambled_text (keyword, alph);         System.out.println (alph);                 msgtxt = decryption (alph, msgtxt);                 msgtxt = message_unparser (msgtxt);         System.out.println (msgtxt);     }             public static String scrambled_text (String key, String alphabet) {         // Write code to create the scrambled alpha here         // 'key' is the keyword that will be used to create the new scrambled alphabet - 'Degrobois' will be used in this case         // 'alphabet' is the unscrambled alphabet from A to Z that needs to be scrambled                 //int a = key.length();         String newkey = key + alphabet;         //int b = newkey.length();                 for (int i=0; i<newkey.length (); i++) {             for (int x=i+1; x<newkey.length (); x++) {                 if (newkey.charAt (i) == newkey.charAt (x)) {                                         newkey = (newkey.substring (0, x) + newkey.substring (x+1));                                                                             }                             }         }                                 return newkey;             }             public static String decryption (String key, String message) {         // Write code to decrypt the message based on the provided key - the new alphabet based on the keyword 'Degrobois'         // 'key' is the scrambled alphabet, and 'message' is the encrypted message                         return message;     }             public static String message_unparser (String message) {         //This method replaces the letter combination QN was a blank space.  QN was the combination chosen to represent a blank space.         //This method does not need to be altered.                 message = message.replaceAll ("QNQN", ".  ");         message = message.replaceAll ("QN", " ");         message = message + '.';         return message;     } }

[nishanthan]

hacker dan.....lolz thxx..ye it's a home work...actually its ma project so yea.....that was helpfulll.......thxx

if i have more problemz i'lll ask dun worry

thx again