✔ cipher funtkioniert nicht so wie ich das will

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.util.Enumeration;
import java.util.Properties;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;


public class ciphition {
    
    /** Creates a new instance of ciphition */
    public ciphition() {
    }
    public static void main(String[] args){
        CipherOutputStream cos;
        FileOutputStream fos;
        InputStream is;
     Properties p=new Properties();
        try {
            is=saves.class.getResourceAsStream("properties");
            p.load(is);
                Enumeration<Object>     e=p.keys();
        while(e.hasMoreElements()){
            String e1=(String) e.nextElement();
            System.out.println(""+e1+"-"+p.getProperty(e1));
        }
            is.close();
            Cipher c = null;
            try {
                c = Cipher.getInstance("DES");
            } catch (NoSuchPaddingException ex) {
                ex.printStackTrace();
            } catch (NoSuchAlgorithmException ex) {
                ex.printStackTrace();
            } 
                String key="12345678";
    Key k = new SecretKeySpec( key.getBytes(), "DES" );
            try {
                c.init( Cipher.ENCRYPT_MODE, k ); 
            } catch (InvalidKeyException ex) {
                ex.printStackTrace();
            } 
    fos=new FileOutputStream("properties.txt");
    cos=new CipherOutputStream(fos,c);
            p.store(cos,null);
            fos.close();
            cos.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    readin();
    }
    public static void readin(){
        CipherInputStream cos;
        FileInputStream fos = null;
         Cipher c = null;
            try {
                c = Cipher.getInstance("DES");
            } catch (NoSuchPaddingException ex) {
                ex.printStackTrace();
            } catch (NoSuchAlgorithmException ex) {
                ex.printStackTrace();
            } 
                String key="12345678";
    Key k = new SecretKeySpec( key.getBytes(), "DES" );
            try {
                c.init( Cipher.DECRYPT_MODE, k ); 
            } catch (InvalidKeyException ex) {
                ex.printStackTrace();
            }
        try {
            fos=new FileInputStream("properties.txt");
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        }
        try {
            cos=new CipherInputStream(fos,c);
        } finally {
        }
            Properties p=new Properties();
        try {
            p.load(cos);
            
            fos.close();
            cos.close();
                      Enumeration<Object>     e=p.keys();
        while(e.hasMoreElements()){
            String e1=(String) e.nextElement();
            System.out.println(""+e1+"-"+p.getProperty(e1));
        }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
       
    }
}

maxchar-300
testchar-234adsf
test-400
maxchar-300
t-
testchar-234adsf