求助java关于音频加密的问题

[Mitos_Yggdrasill]

最近做毕业设计，老师要求给语音通信的数据加密，现在已经完成了语音对话，但是尝试加密的时候总是不行，求大神们帮助
录音过程：

while (thread != null) {
			numBytesRead = line.read(data, 0, 1024);
			try {
                                DESCrypt des = new DESCrypt("123");
				reData = des.encryptByte(data);
				captureOutputStream.write(reData,0,numBytesRead);
			} catch (Exception ex) {
				break;
			}
		}

放音过程：

		while (thread != null) {
			try {
				numBytesRead = playInputStream.read(data);
                                DESCrypt des = new DESCrypt("123");
				reData = des.decryptByte(data);
				line.write(reData,0,1024);
			} catch (IOException e) {
				break;
			} catch (Exception e) {
				e.printStackTrace();
			}
		}

我想求问，这样音频在网络里传输的是byte[]数据吧？
那么如何加密？我用DES对byte[]进行加密解密
在加密的时候没问题，但是在解密的时候总是报错

加密解密代码：

public class DESCrypt {
	private static String strDefaultKey = "national";

	private Cipher encryptCipher = null;

	private Cipher decryptCipher = null;

	public static String byteArr2HexStr(byte[] arrB) throws Exception {
		int iLen = arrB.length;
		// 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
		StringBuffer sb = new StringBuffer(iLen * 2);
		for (int i = 0; i < iLen; i++) {
			int intTmp = arrB[i];
			// 把负数转换为正数
			while (intTmp < 0) {
				intTmp = intTmp + 256;
			}
			// 小于0F的数需要在前面补0
			if (intTmp < 16) {
				sb.append("0");
			}
			sb.append(Integer.toString(intTmp, 16));
		}
		return sb.toString();
	}

	public static byte[] hexStr2ByteArr(String strIn) throws Exception {
		byte[] arrB = strIn.getBytes();
		int iLen = arrB.length;

		// 两个字符表示一个字节，所以字节数组长度是字符串长度除以2
		byte[] arrOut = new byte[iLen / 2];
		for (int i = 0; i < iLen; i = i + 2) {
			String strTmp = new String(arrB, i, 2);
			arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
		}
		return arrOut;
	}

	public DESCrypt() throws Exception {
		this(strDefaultKey);
	}

	public DESCrypt(String strKey) throws Exception {
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		Key key = getKey(strKey.getBytes());

		encryptCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
		encryptCipher.init(Cipher.ENCRYPT_MODE, key);

		decryptCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
		decryptCipher.init(Cipher.DECRYPT_MODE, key);
	}

	public byte[] encrypt(byte[] arrB) throws Exception {
		return encryptCipher.doFinal(arrB);
	}

	public String encrypt(String strIn) throws Exception {
		return byteArr2HexStr(encrypt(strIn.getBytes()));
	}

        public byte[] encryptByte(byte[] arrB) throws Exception {
	 return byteArr2HexStr(encrypt(arrB)).getBytes();
        }

	public byte[] decrypt(byte[] arrB) throws Exception {
		return decryptCipher.doFinal(arrB);
	}

	public String decrypt(String strIn) throws Exception {
		return new String(decrypt(hexStr2ByteArr(strIn)));
	}

	public byte[] decryptByte(byte[] arrB) throws Exception {
		return decrypt(hexStr2ByteArr(new String(arrB)));
	}

	private Key getKey(byte[] arrBTmp) throws Exception {
		// 创建一个空的8位字节数组（默认值为0）
		byte[] arrB = new byte[8];

		// 将原始字节数组转换为8位
		for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
			arrB[i] = arrBTmp[i];
		}

		// 生成密钥
		Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");

		return key;
	}
}

报错：
java.security.InvalidKeyException: Parameters missing
at com.sun.crypto.provider.CipherCore.init(CipherCore.java:388)
at com.sun.crypto.provider.DESCipher.engineInit(DESCipher.java:186)
at javax.crypto.Cipher.implInit(Cipher.java:787)
at javax.crypto.Cipher.chooseProvider(Cipher.java:849)
at javax.crypto.Cipher.init(Cipher.java:1213)
at javax.crypto.Cipher.init(Cipher.java:1153)
at DESCrypt.<init>(DESCrypt.java:55)
at VoicePlay.run(VoicePlay.java:66)
at java.lang.Thread.run(Unknown Source)

跪求解决，万分感谢