Signed applets not working in JDK1.6...........!

[karamvir17]

I have created a signed applet but it is not working in JDK 1.6.....
It gives an AccessControlException
In JDK 1.5 however, it works just fine........Is there a solution to this problem........somebody please help.......
BTW, it is a program which inputs a file and encrypts its contents and then decrypts them to a new file....

The java code for my program is :-

import java.awt.event.*;

import netscape.javascript.*;

import java.awt.*;

import java.applet.*;

import javax.swing.*;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.FileReader;

import java.io.FileWriter;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.BadPaddingException;

import javax.crypto.IllegalBlockSizeException;

import java.security.Key;

import java.security.Security;

import java.security.NoSuchAlgorithmException;

import java.security.InvalidKeyException;

import java.security.AccessControlException;



public class main extends Applet implements ActionListener

{

	Button submit;

	private static final String FNAME = "fname";

	public void init()

	{

		submit = new Button("Submit");

		add(submit);

		submit.addActionListener(this);

	}

	public void actionPerformed(ActionEvent ae)

	{

 		// ------------initialise connection for JavaScript/HTML --------------



		JSObject win = JSObject.getWindow(this); // get HTML document

		JSObject doc = (JSObject)win.eval("document.forms[0]");

//		JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"docValue"+doc);



		//------------ Get the name of file from HTML------------------- 



		String filename = this.getParameter(FNAME);

		JSObject file = (JSObject)doc.getMember(filename);

		String finalfile = (String)file.getMember("value");

		if(finalfile.equals(""))

		{

			JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"No file input. ABORTING...");

			System.exit(0);

		}

		JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"File name:"+finalfile);



		//----------------get contents of file--------------------

		

		String fileContent = readFile(finalfile);

		JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"FileContent:"+fileContent);



		//-------------------------Checking file extension---------------------------------



		String ext = fileExt(finalfile);

		JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"File extension is : "+ext);



		//----------------Send file content to get encrypted and decrypted---------------------



		String decrypted_data = encrypt_decrypt(fileContent);



		//-------------------Putting Decrypted data into a new file----------------------------



		newFile(decrypted_data, ext);

	}

	

	//-----------------------Method to find file extension-----------------------------

	

	public String fileExt(String filename)

	{

		int mid = filename.lastIndexOf(".");

		String ext = "";

		ext = filename.substring(mid+1, filename.length());

		return ext;

	}



	//------------------------------Method to read the inptu file------------------------

	

	public String readFile(String fileName)

	{

		String fileContent = "";

		try

		{

			BufferedReader reader = new BufferedReader(new FileReader(fileName));

			String line;

			fileContent = reader.readLine();

		}

		catch(IOException e){}

		return fileContent;

	}



	//----------------------Method to encrypt and decrypt data-----------------------



	public String encrypt_decrypt(String data)

	{

		String encrypted_data = "";

		String decrypted_data = "";

		try

		{

			KeyGenerator kg = KeyGenerator.getInstance("DES");

			Key key = kg.generateKey();

			Cipher cipher = Cipher.getInstance("DES");

			byte[] byte_data;

			byte_data = data.getBytes();

			cipher.init(cipher.ENCRYPT_MODE, key);

			byte[] result = cipher.doFinal(byte_data);

			encrypted_data = result.toString();

			JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"Encrypted data is : "+encrypted_data);

			cipher.init(cipher.DECRYPT_MODE, key);

			byte[] original = cipher.doFinal(result);

			decrypted_data = new String (original);

			JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"Decrypted data is : "+decrypted_data);

		}

		catch(NoSuchAlgorithmException e)

		{

			e.printStackTrace();

		}

		catch(NoSuchPaddingException e)

		{

			e.printStackTrace();

		}

		catch(InvalidKeyException e)

		{

			e.printStackTrace();

		}



		catch(IllegalStateException e)

		{

			e.printStackTrace();

		}



		catch(IllegalBlockSizeException e)

		{

			e.printStackTrace();

		}



		catch(BadPaddingException e)

		{

			e.printStackTrace();

		}

		return decrypted_data;

	}



	//----------------------Method to write decrypted data to new file---------------------



	public void newFile(String data, String ext)

	{

		String filename = "H:\\karamvir_javap\\Encryption_Decryption_Together\\newfile."+ext;

		JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"New file created is : "+filename);

		try

		{

		BufferedWriter writer = new BufferedWriter(new FileWriter(filename));

		writer.write(data);

		writer.close();

		}

		catch (IOException e)

		{

		}

		JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"New file created is 2 : "+filename);

	}

}

The HTML code is :-

<html>

<body>

<form name="frm">

<p>File:<input type="file" name="File"></p>

<object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" width="300" height="100">

<param name="archive" value="myjarfile.jar">

<param name="code" value="main">

<param name="type" value="application/x-java-applet;version=1.6">

<param name="mayscript" value="true">

<param name="scriptable" value="false">

<param name="fname" value="File">

<param name="submit" value="SUBMIT">

<comment>

<embed code="main" width="300" height="100" mayscript="mayscript" scriptable="true" archive="myjarfile.jar" type="application/x-java-applet;version=1.6" fname="File" submit="SUBMIT"> 

</embed>

</comment>

</object>

</form>

</body>

</html>

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