unity数据加密有两种方法。一种是 C#中对字符串加密解密（对称算法）；另一种是MD5加密算法。现在我们主要看两种加密方法。
在unity中可以使用c#自带的对称算法对数据进行加密，下面两种加密算法：
using
System;
using
System.Text;
using
System.Security.Cryptography;
using
System.IO;
using
UnityEngine;
public
class
StringEncryption{

#region

 方法一 C#中对字符串加密解密（对称算法）
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="encryptKey">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
encryptKey)
{
try
{
byte[]
rgbKey = Encoding.UTF8.GetBytes(encryptKey.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
{
return
encryptString;
}
}
 ///
<summary>
///
DES解密字符串
///
</summary>
///
<param name="decryptString">待解密的字符串</param>
///
<param name="decryptKey">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
decryptKey)
{
try
{
byte[]
rgbKey = Encoding.UTF8.GetBytes(decryptKey);
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.Log("catch");
return
decryptString;
}
}
#endregion

#region

方法二 MD5不可逆加密
 //32位加密
public
string
GetMD5_32(string
s, string
_input_charset)
{
MD5
md5 = new
MD5CryptoServiceProvider();
byte[]
t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
StringBuilder
sb = new
StringBuilder(32);
for
(int
i = 0; i < t.Length; i++)
{
sb.Append(t[i].ToString("x").PadLeft(2,
'0'));
}
return
sb.ToString();
}
//16位加密
public
static
string
GetMd5_16(string
ConvertString)
{
MD5CryptoServiceProvider
md5 = new
MD5CryptoServiceProvider();
string
t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
t2
= t2.Replace("-",
"");
return
t2;
}
#endregion
}
        经测试都是可以用的，第一种加密需要一个自定义的key，解密需要key来解密。
       第二种是常见的MD5加密算法，不可逆的，可用来存储用户密码等信息。