// 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;            }        }