在ASP.NET中提供了加密的解決方案。在名字空間System.Web.Security中包含了類FormsAuthentication，其中有一個方法HashPasswordForStoringInConfigFile。這個方法可以將使用者提供的字元變成亂碼，然後儲存起來，甚至可以 儲存在cookies中。
HashPasswordForStoringInConfigFile方法使用起來很簡單，它支援"SHA1"和"MD5"密碼編譯演算法。
下面的代碼簡單的示範了關於其用法：
<%@ Page language="c#" %>
<%@ Import Namespace="System.Web.Security" %>
<html>
<head>
<script language="C#" runat="server">
public void encryptString(Object sender, EventArgs e)
{
SHA1.Text = FormsAuthentication.HashPasswordForStoringInConfigFile(txtPassword.Text,"SHA1");
MD5.Text =FormsAuthentication.HashPasswordForStoringInConfigFile(txtPassword.Text, "MD5") ;
}
</script>
</head>
<body>
<form runat="server" ID="Form1">
<p>
<b>Original Clear Text Password: </b>
<br/>
<asp:Textbox id="txtPassword" runat="server" />
<asp:Button runat="server" text="Encrypt String" ID="Button1" />
</p>
<p>
<b>Encrypted Password In SHA1: </b>
<asp:label id="SHA1" runat="server" />
</p>
<p>
<b>Encrypted Password In MD5: </b>
<asp:label id="MD5" runat="server" />
</p>
</form>
</body>
</html>
正如你所看到的這樣簡單易用。我們可以把這段加密程式封裝在一個函數裡便於重複的使用。代碼如下：
public string EncryptPassword(string PasswordString,string PasswordFormat )
{
if (PasswordFormat="SHA1"){
EncryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString ,"SHA1");
}
elseif (PasswordFormat="MD5")
{ EncryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString ,"MD5");
}
else
{
EncryptPassword="";
}
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