|
|
Posted by Jerry Stuckle on 02/07/06 13:03
frizzle wrote:
> Thanks, indeed that's what i meant.
> Apparently it's a weaker system then i imagined.
> I guess i'll have to find another alternative again ... :(
>
> Greetings Frizzle.
>
>
> Jim Michaels wrote:
>
>>"frizzle" <phpfrizzle@gmail.com> wrote in message
>>news:1138227180.394441.177630@z14g2000cwz.googlegroups.com...
>>
>>>Carl Vondrick wrote:
>>>
>>>>You may want to look into Mcrypt
>>>>(http://us3.php.net/manual/en/ref.mcrypt.php). But, with Peter said,
>>>>what are you really try to achieve?
>>>
>>>What i'm trying to do is build a way of security that a human is
>>>submitting a form.
>>>I know there are ways out there already, but i also have other purposes
>>>in mind.
>>>
>>>Example:
>>>
>>>Image random generated according to key 1:
>>>
>>> image.php?txt=kjGKUGFfas8gkjafKfasdf
>>>
>>>The image is a php file, getting $_GET['txt'], decrypt it according
>>>key 1, and encrypt it according to key 2. The second encrypting
>>>becomes visible in the actual image.
>>>
>>>I have a have a hidden form field with the value of key 1, and the
>>>visitor has to insert the text from the image / key 2 into a form
>>>field.
>>>
>>>Then after posting i compare the decrypted hidden formfield's value
>>>against the user submitted value ( / image's value). if they match,
>>>the user read the image, and is human ...
>>
>>Not sure, but sounds like a CAPTCHA. They can be OCR'd
>>(http://www.ocr-research.org.ua/ ) from what I found in an earlier post.
>>
>>
>>>It might sound stupid, sloppy or whatever, but i'm just trying to
>>>achieve my goal.
>>>
>>>Thanks.
>>>
>
>
Why? Is this a high security site?
OCR'ing CAPTCHA images does take time and effort - each one is typically
different. What would be on your site which would require that much effort?
Not to denigrate your site in any form - but the fact is, spammers
et.al. wouldn't bother with 99.99999% of the CAPTCHA images. They'll
just go onto another site.
It's like your front door. Your lock isn't unpickable - it just
requires time and effort on a burglar's part to pick. However, you lock
your door anyway, because it's a deterrent - the burglar will most
likely move on (unless you're storing Fort Knox inside).
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
==================
Navigation:
[Reply to this message]
|