加密|页面在ASP.NET中提供了加密的功能。名字空间System.Web.Security中包含了类FormsAuthentication，其中有一个方法HashPasswordForStoringInConfigFile。这个方法可以将用户提供的字符变成乱码，然后存储起来。注意此方法是不能继承的。
下面的代码就是在做注册页面时将数据加密后存储到数据库的过程
Imports System.Web.Security
Imports System.Data
Imports System.Data.SqlClient  '////////所需要的名称空间

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim PassFormate As String
        '///////////////EncryptPassword调用函数
        PassFormate = EncryptPassword(uid.Text, "md5")   '//////////或者是EncryptPassword(uid.Text, "sha1")
        'TextBox2.Text = EncryptPassword(uid.Text, "md5")
        'TextBox3.Text = EncryptPassword(uid.Text, "sha1")
        '///////////这些大家自己试验吧
        'TextBox4.Text = FormsAuthentication.FormsCookieName
        'TextBox5.Text = FormsAuthentication.FormsCookiePath
        'TextBox6.Text = FormsAuthentication.GetRedirectUrl(uid.Text, True)
        'FormsAuthentication.SetAuthCookie(uid.Text, True)

        Dim sql As String = "insert into pwd(uid,pwd) values(uid,pwd)"
        Dim comm As SqlCommand = New SqlCommand(sql, conn)
        conn.Open()
        comm.Parameters.Add(New SqlParameter("uid", SqlDbType.Char, 16))
        comm.Parameters("uid").Value = uid.Text
        comm.Parameters.Add(New SqlParameter("pwd", SqlDbType.Char, 16))
        comm.Parameters("pwd").Value = PassFormate
        comm.ExecuteNonQuery()
        
    End Sub

    '////////////////定义加密函数，可以随时调用。
    Function EncryptPassword(ByVal password As String, ByVal passwordformate As String)
        If passwordformate = "sha1" Then
            EncryptPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(password, "sha1")
        ElseIf passwordformate = "md5" Then
            EncryptPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(password, "md5")
        Else
            EncryptPassword = ""
        End If

    End Function
至于用户的验证也是一样的思路了。