This tutorial will tell you how to secure your web pages through Image Security. 1. As first step create some images in photoshop as shown below:2. Now Create a database named as SecImages. Then create a table with three fields:Here in ImageName field enter image name with its extension and in ImageValue field store image value. The value of this field should be the same as original image value.CODING PART:Create an .asp page named ImageSecurity.asp. Open Database: 

strConnect= "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=C:\Inetpub\wwwroot\SecImages.mdb"

Set objConn=Server.CreateObject("ADODB.connection")

objConn.Open strConnect

' Connection string and SQL statement
strConnect.CursorLocation = 3
response.buffer=true
%>

  

4. Now pick random image from database with the help of random function <%
dim intRnd
sqlt = "select * from Table1" ' Your Table Name
Set rs = strConnect.execute(sqlt)
' Generating random number from total number of records
Randomize Timer
intRnd = (Int(RND * rs.RecordCount))
rs.Move intRnd
' Showing the random statement

image=rs.Fields("IamgeName")
response.write "<img src="&image &_
">"
%> Declare a variable intRnd to hold the random record number. Randomize Timer statement is used to initialize the random-number generator. Then RND Function is used to generate a random number between 1 and total number of records availabe .

Once we have got a random number between 1 and total number of records, we can move the Recordset Cursor to that random record by using Recordset. Then we show the random image from database.

IMAGE VALUE:<input name="imageoriginalvalue" type="hidden" id="imageoriginalvalue" value= <% OriginalValue=rs.Fields("ImageValue")
Response.Write(OriginalValue)%>>  Now in hidden field we hold image original value from our database. This value will use to ensure that a user enter a correct value.  ERROR: <% if Request("Error")="True" then
Response.Write("<b><font size=""4"">You have entered a Wrong Security Code!</font></b>")
else
response.Write("<strong>Please fill the following Details</strong>")
end if
%>  Here we handle Error part. if user enter a wrong code then a message will show. PROCESS PART: After submitting form, we will check that user enter a correct image value or not. Create another .asp named ImageSecurityProcess.asp CODING FOR IMAGESECURITYPROCESS.ASP <%
SecCodeOriginal=Request.Form("imageoriginalvalue") 'Hidden field Value
SecCodeUser=Request.Form("imagevalue")
Name=Request.Form("Name")
EmailAddress=Request.Form("EmailAddress")
if SecCodeOriginal=SecCodeUser then
response.Write("<strong>You have entered a correct image code.<strong>")
else
response.Redirect "ImageSecurity.asp?Error=True"
end if
%>  Here we declare SecCodeOrigianl variable for holding original image value from database and SecCodeUser for code that user have entered.  In if condition we check that whether the image orignial value is equal to user value or not, if Yes then a message will show or if No then it will redirect to ImageSecurity.asp page with Error value. Error part is already mention above. For Demo Click Here   [Download Source] 

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