Javaの簡単な暗号解読アルゴリズム

Javaの簡単な暗号解読アルゴリズム、異或演算を使用する

package cn.std.util;

import java.nio.charset.Charset;


public class DeEnCode {

	private static final String key0 = "FECOI()*&<MNCXZPKL";
	private static final Charset charset = Charset.forName("UTF-8");
	private static byte[] keyBytes = key0.getBytes(charset);
	
	public static String encode(String enc){
		byte[] b = enc.getBytes(charset);
		for(int i=0,size=b.length;i<size;i++){
			for(byte keyBytes0:keyBytes){
				b[i] = (byte) (b[i]^keyBytes0);
			}
		}
		return new String(b);
	}
	
	public static String decode(String dec){
		byte[] e = dec.getBytes(charset);
		byte[] dee = e;
		for(int i=0,size=e.length;i<size;i++){
			for(byte keyBytes0:keyBytes){
				e[i] = (byte) (dee[i]^keyBytes0);
			}
		}
		return new String(e);
	}

	public static void main(String[] args) {
		String s="you are right";
		String enc = encode(s);
		String dec = decode(enc);
		System.out.println(enc);
		System.out.println(dec);
	}
}