信息加密算法

这是解密的东西，根据这个写的加密算法；

package bag;

import java.util.*;


public class ChartoKey {

    /*
     * 生成算子
     */

    public int Lwords() {
        Random ran = new Random();
        int a = ran.nextInt(100);
        return a;
    }

    /*
     * 根据加密算子和ASCII码生成字符算子
     * 字符算子=ASCii-加密算子
     */
    public int keyWords(String a, int i) {

        char key1 =a.charAt(0);
        int key2 = key1 - i;
        return key2;
    }

    /*
     * 根据加密算子和字符位置生成位置码 位置码=位置+加密算子
     */

    public int locationKey(int location, int key) {
        int locationWord = location + key;
        return locationWord;
    }
   
    /*
     * 字符位置补齐
     * 将所有子字符转换为四位输出
     */
    public String patternWord(String str1) {
       
        String str4 = "";
        String str2 = "";
        if (str1.length() < 4) {
            int i = 4 - str1.length();
            for (int m = 0; m < i; m++) {
                str4 += "0";
            }
            str2 = str4 + str1;
        } else
            str2 = str1;
        return str2;
    }

    /*
     * 打乱编码顺序
     */
    public String[] fina(String[] input){
        Random ran=new Random();
        String a=new String();
        int len=input.length;
        for(int i=0;i<len;i++){
            int num1=ran.nextInt(len);
            int num2=ran.nextInt(len);
            a=input[num1];
            input[num1]=input[num2];
            input[num2]=a;
        }
    return input;   
    }
    /*
     * @main
     */
    public static void main(String[] args) {
        ChartoKey cha=new ChartoKey();
        Scanner input=new Scanner(System.in);
        String inputline=input.nextLine();
        String[] outkey=new String[inputline.length()];
        for(int i=0;i<inputline.length();i++){
            String sonStr=inputline.substring(i,i+1);
            int keyWords=cha.Lwords();
            String locationkey=cha.patternWord(cha.locationKey(i, keyWords)+"");//位置码
            String keyword=cha.patternWord(cha.keyWords(sonStr, keyWords)+"");//字符码
            String lwords=cha.patternWord(keyWords+"");//算子
            outkey[i]=lwords+locationkey+keyword;
        }
        cha.fina(outkey);
        for(int i=0;i<inputline.length();i++){
          System.out.print(outkey[i]);
        }
    }
}