filter.java

用差分方法攻击加密文件

package difference_attack;

import javax.swing.filechooser.FileFilter;
import java.io.*;



public class Filter extends javax.swing.filechooser.FileFilter {
  String  postfix;
  public Filter(String s) {
    super();
     postfix=s;
  }
  public boolean accept(File f){
          return f.getName().toLowerCase().endsWith(postfix)
                 ||f.isDirectory();
     }

     public String getDescription(){
       return "*"+ postfix;

     }

}