// 初始化DES加密的密钥和一个随机的、8比特的初始化向量(IV)
        private byte[] key_8 = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef };
        private byte[] IV_8 = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef };
        /// 
        /// DES加密字符串
        /// 
        /// 待加密的字符串
        /// 加密密钥,要求为8位
        /// 密钥向量
        /// 加密成功返回加密后的字符串，失败返回源字符串
        private string DES_Encrypt(string encryptString, byte[] rgbKey, byte[] rgbIV)
        {
            try
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }
        /// 
        /// DES解密字符串
        /// 
        /// 待解密的字符串
        /// 解密密钥,要求为8位,和加密密钥相同
        /// 密钥向量
        /// 解密成功返回解密后的字符串，失败返源字符串
        private string DES_Decrypt(string decryptString, byte[] rgbKey, byte[] rgbIV)
        {
            try
            {
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }