用下面这种方式解密的数据，能不能得到它的加密方式？

        static string Password = "XXXXX";

        public static string Decrypt(string source)
        {
            string s;

            if (String.IsNullOrEmpty(source))
                throw new ArgumentException("No data given");
            byte[] inputData = Convert.FromBase64String(source);
            if (inputData.Length < 8)
                throw new ArgumentException("Invalid input data");

            byte[] salt = new byte[8];
            for (int i = 0; i < salt.Length; i++)
            {
                salt[i] = inputData[i];
            }

            Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(Password, salt);
            Rijndael rijndael = Rijndael.Create();
            rijndael.Padding = PaddingMode.ISO10126;
            rijndael.IV = rfc2898DeriveBytes.GetBytes(rijndael.BlockSize / 8);
            rijndael.Key = rfc2898DeriveBytes.GetBytes(rijndael.KeySize / 8);
            using (MemoryStream memoryStream = new MemoryStream())
            using (
                CryptoStream cryptoStream =
                    new CryptoStream(memoryStream, rijndael.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cryptoStream.Write(inputData, 8, inputData.Length - 8);
                cryptoStream.Close();
                byte[] bytes = memoryStream.ToArray();
                s = Encoding.Unicode.GetString(bytes);
            }
            return s;
        }

对加密解密这块不熟，请有经验的朋友解答，谢谢。
如果需要，我有几个样例数据与加密后的结果。