大白话理解：将明眼能看到的字符给用另一种读不懂的语言给翻译，就像是摩斯密码……就像base64加密，都有异曲同工之妙。

建一个新的类（这里放了aes加密解密的方法）

public static class AesPassword
    {

        /// <summary>
        /// Aes加解密钥必须32位
        /// </summary>
        public static string AesKey = "mima"; // 密钥
        /// <summary>
        /// 获取Aes32位密钥
        /// </summary>
        /// <param name="key">Aes密钥字符串</param>
        /// <returns>Aes32位密钥</returns>
        public static byte[] GetAesKey(string key)
        {
            if (string.IsNullOrEmpty(key))
            {
                throw new ArgumentNullException("key", "Aes密钥不能为空");
            }
            if (key.Length < 32)
            {
                // 不足32补全
                key = key.PadRight(32, '0');
            }
            if (key.Length > 32)
            {
                key = key.Substring(0, 32);
            }
            return Encoding.UTF8.GetBytes(key);
        }

 ///  AES 加密
 /// </summary>
 /// <param name="str">明文（待加密）</param>
 /// <param name="key">密文</param>
 /// <returns></returns>
        public static string AesEncrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str))
                return null;
            Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);

            RijndaelManaged rm = new RijndaelManaged
            {
                Key = GetAesKey(key),
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            };

            ICryptoTransform cTransform = rm.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
        /// <summary>
        ///  AES 解密
        /// </summary>
        /// <param name="str">明文（待解密）</param>
        /// <param name="key">密文</param>
        /// <returns></returns>
        public static string AesDecrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str))
                return null;
            Byte[] toEncryptArray = Convert.FromBase64String(str);

            RijndaelManaged rm = new RijndaelManaged
            {
                Key = GetAesKey(key),
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            };

            ICryptoTransform cTransform = rm.CreateDecryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Encoding.UTF8.GetString(resultArray);
        }
/// <summary>
/// Aes加密
/// </summary>
/// <param name="source">源字符串</param>
/// <param name="key">aes密钥，长度必须32位</param>
/// <returns>加密后的字符串</returns>
public static string EncryptAes(string source, string key)
        {
            using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
            {
                aesProvider.Key = GetAesKey(key);
                aesProvider.Mode = CipherMode.ECB;
                aesProvider.Padding = PaddingMode.PKCS7;
                using (ICryptoTransform cryptoTransform = aesProvider.CreateEncryptor())
                {
                    byte[] inputBuffers = Encoding.UTF8.GetBytes(source);
                    byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
                    aesProvider.Clear();
                    aesProvider.Dispose();
                    return Convert.ToBase64String(results, 0, results.Length);
                }
            }
        }

        /// <summary>
        /// Aes解密
        /// </summary>
        /// <param name="source">源字符串</param>
        /// <param name="key">aes密钥，长度必须32位</param>
        /// <returns>解密后的字符串</returns>
        public static string DecryptAes(string source, string key)
        {
            using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
            {
                aesProvider.Key = GetAesKey(key);
                aesProvider.Mode = CipherMode.ECB;
                aesProvider.Padding = PaddingMode.PKCS7;
                using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor())
                {
                    byte[] inputBuffers = Convert.FromBase64String(source);
                    byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
                    aesProvider.Clear();
                    return Encoding.UTF8.GetString(results);
                }
            }
        }

    }

需要调用的文件

public static void SwitchPassword() {
            string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, $@"config/config.json");

            //加密
            //string apn = AesPassword.AesEncrypt("LTAI****LyZ7q9", AesPassword.AesKey);

            var patternJson = JsonConvert.DeserializeObject<ConfigModel>(File.ReadAllText(path));

            //解密
            var _accesskey = AesPassword.AesDecrypt(patternJson.accesskey, AesPassword.AesKey);
            var _secretkey = AesPassword.AesDecrypt(patternJson.secretkey, AesPassword.AesKey);


            ConfigIni.AccessKey = _accesskey;

            ConfigIni.SecretKey = _secretkey;
        }   


  public class ConfigModel
        {
           
            public string accesskey { get; set; }

            public string secretkey { get; set; }

        }

验证