public void testDES() {
		String source = "abcdefghijklmnopqrstuvwxyz";
		try {
			String key = DESCoder.initKey(source);
			byte[] data = DESCoder
					.encrypt(source.getBytes(), key, DESCoder.DES);
			byte[] result = DESCoder.decrypt(data, key, DESCoder.DES);
			assertEquals(source, new String(result));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}