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From "McCormack, Chris" <>
Subject RE: [slightly OT] defensive strategy
Date Tue, 13 Apr 2004 10:39:14 GMT
Interesting problem. 
You could implement image tickets, ie for every user that wants to submit a form you generate
a random sequence of characters as an obscured image. To enable the user to submit the form
they have to visually read and enter the code displayed in the image.
A simpler but less sound option would be to write a session and persistent cookie to the user
after their initial submission.

Someone else on the list may have dealt with a similar problem and have a better solution


-----Original Message-----
From: Adam Hardy []
Sent: 13 April 2004 11:23
To: Struts Users Mailing List
Subject: [slightly OT] defensive strategy

Sorry for posting this OT question but I've got an issue that people on 
this list are very likely to have tackled:

I am developing a traditional online survey app, the kind of thing that 
alot of people must have done. I am wondering how to protect it from 
script-kiddies who might want to see if they can bombard it with fake 

It's basically public and anyone can take part in the surveys it will run.

I put a switch to check for a flag in the session so that people don't 
vote more than once from the websites where the surveys will be deployed.

But I am worried that kids writing scripts will not be stopped by 
session flags. Is it worth writing an algorithm to store the IP 
addresses used for the last hour? Or can they spoof IP addresses?

If it is useful noting the IP addresses, how best should I store them? 
In a hashtable in application scope? In the database? In a session EJB?


struts 1.2 + tomcat 5.0.19 + java 1.4.2
Linux 2.4.20 Debian

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