学习来源：https://blog.csdn.net/a451319296/article/details/109072863

为了方便本地json保存数据，可以将加密写在保存json数据之前，参考多方链接写了一个简易的字符串加密算法，运行结果：

image.png

代码如下：

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using UnityEngine;

public class Encryption : MonoBehaviour
{

    void Start()
    {
        //加密测试
        string teststr = "我今天真高兴！";
        Debug.Log(StringToByteString(teststr));

        //解密测试
        string testbytestring = "PHShWiwLgN2BDIaUBY8devCFx3kSv+P6y34mCMV4MX8=";
        Debug.Log(ByteStringToString(testbytestring));

    }

    //加密
    public static string StringToByteString(string str)
    {
        return EncryptDES(Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(str)));
    }

    //解密
    public static string ByteStringToString(string str)
    {
        return System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(DecryptDES(str)));
    }

    #region  字符串加密解密

    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
    /// <summary>
    /// DES加密字符串
    /// </summary>
    /// <param name="encryptString">待加密的字符串</param>
    /// <param name="key">加密密钥,要求为8位</param>
    /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
    public static string EncryptDES(string encryptString, string key = "13717421")
    {
        try
        {
            byte[] rgbKey = Encoding.UTF8.GetBytes(key.Substring(0, 8));
            byte[] rgbIV = Keys;
            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();
            cStream.Close();
            return Convert.ToBase64String(mStream.ToArray());
        }
        catch
        {
            //Debug.LogError("StringEncrypt/EncryptDES()/ Encrypt error!");
            return encryptString;
        }
    }

    /// <summary>
    /// DES解密字符串
    /// </summary>
    /// <param name="decryptString">待解密的字符串</param>
    /// <param name="key">解密密钥,要求为8位,和加密密钥相同</param>
    /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
    public static string DecryptDES(string decryptString, string key = "13717421")
    {
        try
        {
            byte[] rgbKey = Encoding.UTF8.GetBytes(key);
            byte[] rgbIV = Keys;
            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();
            cStream.Close();
            return Encoding.UTF8.GetString(mStream.ToArray());
        }
        catch
        {
            //Debug.LogError("StringEncrypt/DecryptDES()/ Decrypt error!");
            return decryptString;
        }
    }

    #endregion
}