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Image Security |
 HTML
Tutorials
Photoshop
Tutorials
ASP
Tutorials
FAQ |
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| Description:
This tutorial will tell you how to secure your web pages through Image
Security. |
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| 1. As first step create some images in
photoshop as shown below: |
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| 2. Now Create a database named as SecImages.
Then create a table with three fields: |
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3. Enter data: |
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| 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.
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| Open Database: |
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| <%
Dim sqlt, objConn
Dim strConnect
Dim rs
Dim OriginalValue,image
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
%> |
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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 &_
">"
%> |
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| 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. |
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| IMAGE VALUE: |
<input
name="imageoriginalvalue" type="hidden" id="imageoriginalvalue"
value= <% OriginalValue=rs.Fields("ImageValue")
Response.Write(OriginalValue)%>> |
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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. |
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ERROR: |
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<% 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
%> |
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Here we handle Error part. if user enter
a wrong code then a message will show. |
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PROCESS PART: |
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After submitting form, we will check that
user enter a correct image value or not. Create another .asp named ImageSecurityProcess.asp |
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CODING FOR IMAGESECURITYPROCESS.ASP |
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<%
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
%> |
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Here we declare SecCodeOrigianl variable
for holding original image value from database and SecCodeUser for code
that user have entered. |
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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. |
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For Demo
Click Here |
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[ASP Index] |
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All Rights Reserved.
Contact: webmaster@tutorialscenter.com,
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