你的主页或者你管理的网站有各种密码需要保护，把密码直接放在数据库或者文件中存在不少安全隐患，所以密码加密后存储是最常见的做法。在ASP.NET中实现加密非常容易。.NET SDK中提供了CookieAuthentication类，其中的HashPasswordForStoringInConfigFile方法可直接使用MD5和SHA1算法。例子如下：<br
file: encrypting.aspx<br
<%@ Page language="c#" Codebehind="encrypting.cs" AutoEventWireup="false" Inherits="encrypting.encrypting" %<br
<html<head<br
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0"<br
<meta name="CODE_LANGUAGE" Content="C#"</head<br
<body<br
<br
<form method="post" runat="server"<br
<p </p<br
<p<br
<asp:TextBox id=TextBox1 runat="server"</asp:TextBox<br
<asp:Button id=Button1 runat="server" Text="encrypting"</asp:Button</p<br
<pEncrypting Password(MD5):<br
<asp:Label id=MD5 runat="server"</asp:Label</p<br
</form<br
<br
</body</html<br
<br
file:encrypting.cs<br
<br
namespace encrypting<br
{<br
using System;<br
using System.Collections;<br
using System.ComponentModel;<br
using System.Data;<br
using System.Drawing;<br
using System.Web;<br
using System.Web.SessionState;<br
using System.Web.UI;<br
using System.Web.UI.WebControls;<br
using System.Web.UI.HtmlControls;<br
using System.Web.Security;<br
/// <summary<br
/// Summary description for encrypting.<br
/// </summary<br
public class encrypting : System.Web.UI.Page<br
{<br
protected System.Web.UI.WebControls.Label MD5;<br
protected System.Web.UI.WebControls.Button Button1;<br
protected System.Web.UI.WebControls.TextBox TextBox1;<br
<br
public encrypting()<br
{<br
Page.Init += new System.EventHandler(Page_Init);<br
}<br
protected void Page_Load(object sender, EventArgs e)<br
{<br
if (!IsPostBack)<br
{<br
//<br
// Evals true first time browser hits the page<br
//<br
}<br
}<br
protected void Page_Init(object sender, EventArgs e)<br
{<br
//<br
// CODEGEN: This call is required by the ASP+ Windows Form Designer.<br
//<br
InitializeComponent();<br
}<br
/// <summary<br
/// Required method for Designer support - do not modify<br
/// the contents of this method with the code editor.<br
/// </summary<br
private void InitializeComponent()<br
{<br
Button1.Click += new System.EventHandler (this.Button1_Click);<br
this.Load += new System.EventHandler (this.Page_Load);<br
}<br
public void Button1_Click (object sender, System.EventArgs e)<br
{<br
MD5.Text = CookieAuthentication.HashPasswordForStoringInConfigFile(TextBox1.Text,"MD5");<br
//SHA1 use CookieAuthentication.HashPasswordForStoringInConfigFile(TextBox1.Text,"SHA1");<br
}<br
}<br
}<br
注意：类CookieAuthentication的namespace是System.Web.Security。
