import java.util.Base64;

class encod {
    private final static String SALT = "Tsy";　　　　//添加盐值，增加解密难度
    private final static int REPART = 5;　　　　　　　//设定加密次数，次数越多解密越难，但是会增加垃圾空间（原因是进行了字符串的修改）
    public static String encode(String msg) {
        String tsy = msg + "{" + SALT + "}";
        byte[] date = tsy.getBytes();
        for (int i = 0; i < REPART; i++) {
            date = Base64.getEncoder().encode(date);
        }
        return new String(date);
    }
    public static String decode(String msg) {
        byte[] date = msg.getBytes();
        for (int i = 0; i <REPART; i++) {
            date = Base64.getDecoder().decode(date);
        }
        return new String(date).replace("{Tsy}", "");
    }
}
public class T {
    public static void main(String[] args) {
        String msg1 = "Tsyscv";
        System.out.println(msg1.hashCode());
        String msg = encod.encode("www.mldn.cn");
        System.out.println(msg);
        System.out.println(encod.decode(msg));
    }
}