winform 配置文件的加密解密
Visual Studio 命令提示(2010) 窗口下直接输入 :
解密
aspnet_regiis -pdf connectionStrings 程序文件夹全目录

加密
aspnet_regiis -pef connectionStrings 程序文件夹全目录

注意：加密解密过程中必须把配置文件名称改为web.config
程序运行一定要改回来App.cong

也可以通过运行CMD切换到命令提示符下，进入到C:\WINDOWS\Microsoft.net\Framework\v2.0.xxxx下， 
其中 xxxx 是你所用的Framework版本，可以通过打开上述目录得到。 
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配置文件：加密前
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="str1" connectionString="data source=127.0.0.1;database=CustomerServiceDB; 
uid=sa;pwd=123" />
</connectionStrings>
</configuration> 
===================================
配置文件：加密后
===================================

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings configProtectionProvider="RsaProtectedConfigurationProvider">
<EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element"
xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc" />
<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
<EncryptedKey xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-1_5" />
<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
<KeyName>Rsa Key</KeyName>
</KeyInfo>
<CipherData>

<CipherValue>UqupaYVDA7WOWEWwG1foftuhquDgLMkmgGQbDGceawbDOQzjdRQzRU9/tyr1GT0qHnAP5tAm/2PO1SaFQ 
EHva6a3yVUaDdHjXYdpNx5YiI0O5sXssWZCRE7kwFPHKoK6RsIMEqjgVDFEkWFhwgjDUsIiL1TURpMcCL6HfPtP 
+ns=</CipherValue>
</CipherData>
</EncryptedKey>
</KeyInfo>
<CipherData>
<CipherValue>w9cu5AenHpo4oAVZYogic3CY9nQDFkutN4OAxYnmP/iBFfwdqBBJav/h7pGUrN+ 
+gWjT9t9IBkTWlLKd0/mEB2IIdmuvwEDLywxNZvPacbyzRI1tLlKf6oD0VLkkEqxgHD6Vh+AaM 
+zypwKttzKRrAIt6uxxOzinz7cLWXEZwYfmX+ZZ7+ob8hbh0rW0Ehn2bq4DjhysROW98DPublmnJw==</CipherValue>
</CipherData>
</EncryptedData>
</connectionStrings>
</configuration>