Re: Warped Text...
Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). Hi: I just wanted to know where we are right now. I did some tests. Here is the results: http://www.pwntcha.net/test.html?file=20050910023800guNNub.jpeg Since we can also change the SVG file. Here is another sample : http://www.pwntcha.net/test.html?file=20050910022917hUSpnb.jpeg Best Regards, Antonio Gallardo. P.S: I am not trying to defeat the above statement.
Re: Warped Text...
Il giorno 02/set/05, alle 17:32, Pier Fumagalli ha scritto: Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). Indeed, but my CAPTCHA widget is not tied to a particular image generation algorithm. It just calls a pipeline which must be able to get the string to be rendered from a session attribute. If you want, you can replace the one in the sample with one using your generator. Ugo -- Ugo Cei Tech Blog: http://agylen.com/ Open Source Zone: http://oszone.org/ Wine Food Blog: http://www.divinocibo.it/
Re: Warped Text...
On 8 Sep 2005, at 16:47, Ugo Cei wrote: Il giorno 02/set/05, alle 17:32, Pier Fumagalli ha scritto: Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). Indeed, but my CAPTCHA widget is not tied to a particular image generation algorithm. It just calls a pipeline which must be able to get the string to be rendered from a session attribute. If you want, you can replace the one in the sample with one using your generator. Chill... No need to be defensive... Pier smime.p7s Description: S/MIME cryptographic signature
Re: Warped Text...
Il giorno 08/set/05, alle 18:53, Pier Fumagalli ha scritto: Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). Indeed, but my CAPTCHA widget is not tied to a particular image generation algorithm. It just calls a pipeline which must be able to get the string to be rendered from a session attribute. If you want, you can replace the one in the sample with one using your generator. Chill... No need to be defensive... I assure you that I'm not being defensive at all :-) I was just trying to suggest that your reader would be a good complement to the CAPTCHA support in CForms and it would be better to show them together in a sample rather than not. Cheers, Ugo -- Ugo Cei Tech Blog: http://agylen.com/ Open Source Zone: http://oszone.org/ Wine Food Blog: http://www.divinocibo.it/
Re: Warped Text... (off topic)
Dirk-Willem van Gulik wrote:
On Fri, 2 Sep 2005, Pier Fumagalli wrote:
http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/
Ciao,
Yep, but SVG IMVHO is quite overkill to generate a simple image...
For something really simple:
sub getBCD {
$_ = (123567,36,13457,13467,2346,12467,24567,136,1234567,12346)[ shift
@_ ];
return (((m/1/) ? ' _ ' : ' '),
((m/2/) ? '|' : ' '). ((m/4/) ? '_' : ' '). ((m/3/) ? '|' : '
'),
((m/5/) ? '|' : ' '). ((m/7/) ? '_' : ' '). ((m/6/) ? '|' : '
'));
};
map { my @r = getBCD($_); map { $out[ $_ ] .= $r[$_].' '; } (0 .. 2); } '3231'
=~ m/./g;
print join(\n,@out);
Just kidding.
Hey, nice to see you here!
As my perl is more than limited, I had to run it to understand what it
does. Brilliant :-)
Sylvain
--
Sylvain WallezAnyware Technologies
http://people.apache.org/~sylvain http://www.anyware-tech.com
Apache Software Foundation Member Research Technology Director
Re: Warped Text...
Pier Fumagalli wrote: On 2 Sep 2005, at 16:23, Gianugo Rabellino wrote: On 9/2/05, Pier Fumagalli [EMAIL PROTECTED] wrote: Guys, for one of our registration projects, we needed to verify that a user is really in front of the browser (no automatons allowed). I wrote, then, a little text-warper that randomly stretches text for a user to see (and re-type) and writes out JPEG files. In addition to that I wrote a little random-text generator and encryptor (so that you can be sure the text displayed is nowhere in your HTML). An example of a generated image is attached here. Did you look at what Ugo did with captchas? http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/ Ciao, Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). I kinda like more random things! :-P :-P Pier Ugo's work built on some stuff I did a long time ago. I did a gaussian blur on the text just as a proof of concept. Of course, the SVG filters have displacement maps, so ideally you'd add one in addition to the stuff that's already there. Tony
Warped Text...
Guys, for one of our registration projects, we needed to verify that a user is really in front of the browser (no automatons allowed). I wrote, then, a little text-warper that randomly stretches text for a user to see (and re-type) and writes out JPEG files. In addition to that I wrote a little random-text generator and encryptor (so that you can be sure the text displayed is nowhere in your HTML). An example of a generated image is attached here. attachment: example.jpeg Now, all this was implemented as cocoon components (because, of course, we use it with Cocoon). Anyone interested in me committing this to SVN? I'm thinking along the lines of a userid block. Note, there's no CFORM integration as of now as I have not looked into it (CFORMs, yeah, I don't know them), but as far as I heard it should be a straightforward widget that can be implemented in no time. Shall I commit? Pier smime.p7s Description: S/MIME cryptographic signature
Re: Warped Text...
On 9/2/05, Pier Fumagalli [EMAIL PROTECTED] wrote: Guys, for one of our registration projects, we needed to verify that a user is really in front of the browser (no automatons allowed). I wrote, then, a little text-warper that randomly stretches text for a user to see (and re-type) and writes out JPEG files. In addition to that I wrote a little random-text generator and encryptor (so that you can be sure the text displayed is nowhere in your HTML). An example of a generated image is attached here. Did you look at what Ugo did with captchas? http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/ Ciao, -- Gianugo Rabellino Pro-netics s.r.l. - http://www.pro-netics.com Orixo, the XML business alliance: http://www.orixo.com (blogging at http://www.rabellino.it/blog/)
Re: Warped Text...
On 2 Sep 2005, at 16:23, Gianugo Rabellino wrote: On 9/2/05, Pier Fumagalli [EMAIL PROTECTED] wrote: Guys, for one of our registration projects, we needed to verify that a user is really in front of the browser (no automatons allowed). I wrote, then, a little text-warper that randomly stretches text for a user to see (and re-type) and writes out JPEG files. In addition to that I wrote a little random-text generator and encryptor (so that you can be sure the text displayed is nowhere in your HTML). An example of a generated image is attached here. Did you look at what Ugo did with captchas? http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/ Ciao, Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). I kinda like more random things! :-P :-P Pier attachment: gianugo.jpg attachment: gianugo.jpg attachment: gianugo.jpg attachment: gianugo.jpg attachment: gianugo.jpg attachment: gianugo.jpg smime.p7s Description: S/MIME cryptographic signature
Re: Warped Text...
Pier Fumagalli wrote: Did you look at what Ugo did with captchas? http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/ Ciao, Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). Just curious: what do you use to produce the image? If it's lighter and more efficient that SVG, we may simply consider using your stuff for the captcha widget. Sylvain -- Sylvain WallezAnyware Technologies http://people.apache.org/~sylvain http://www.anyware-tech.com Apache Software Foundation Member Research Technology Director
Re: Warped Text... (off topic)
On Fri, 2 Sep 2005, Pier Fumagalli wrote:
http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/
Ciao,
Yep, but SVG IMVHO is quite overkill to generate a simple image...
For something really simple:
sub getBCD {
$_ = (123567,36,13457,13467,2346,12467,24567,136,1234567,12346)[ shift
@_ ];
return (((m/1/) ? ' _ ' : ' '),
((m/2/) ? '|' : ' '). ((m/4/) ? '_' : ' '). ((m/3/) ? '|' : '
'),
((m/5/) ? '|' : ' '). ((m/7/) ? '_' : ' '). ((m/6/) ? '|' : '
'));
};
map { my @r = getBCD($_); map { $out[ $_ ] .= $r[$_].' '; } (0 .. 2); } '3231'
=~ m/./g;
print join(\n,@out);
Just kidding.
Dw.
Re: Warped Text...
On 2 Sep 2005, at 16:44, Sylvain Wallez wrote: Pier Fumagalli wrote: Did you look at what Ugo did with captchas? http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/ Ciao, Yep, but SVG IMVHO is quite overkill to generate a simple image... Plus I suspect that the blurring algorithm is quite easy to recognize (in terms of running a simple image analysis package over the generated output). Just curious: what do you use to produce the image? AWT... I create an image, dump some text into it, calculate a couple of sine-waves, use them as the displacement base, re-scale the warped image while antialiasing it... On my laptop, with Eclipse/iTunes/ blablalba and so on running, I can get something like 4 requests/ second (9 kilobytes/second) on 100x50 pixel images. It can be optimized a lot, I'm sure about it, I waste quite a large amount of cylcles, but the code is so simple (100 lines with comments) that in a couple of iterations I'm pretty sure I can double the thrugput. If it's lighter and more efficient that SVG, we may simply consider using your stuff for the captcha widget. Pretty sure it's lighter than SVG (even in its current state)! :-D I'm all up for it, as long as it can be found also without CFORMs enabled (I don't normally include them but I need the reader) and as long as I don't have to integrate it (as I wouldn't know where to start). Shall I commit it in a simple block with a couple of samples, just to show how it works??? Pier smime.p7s Description: S/MIME cryptographic signature
Re: Warped Text...
Pier Fumagalli wrote: Guys, for one of our registration projects, we needed to verify that a user is really in front of the browser (no automatons allowed). I wrote, then, a little text-warper that randomly stretches text for a user to see (and re-type) and writes out JPEG files. Amazingly enough, PWNtcha [0] does not seem to be able to decode your rather simple text warping. It's intriguing to see how their routines can solve captchas even humans have to concentrate on, yet is unable to solve a simple text warp. Jorg [0] http://sam.zoy.org/pwntcha/ (i took the liberty of running your warps through their cgi)
Re: Warped Text...
Pier Fumagalli wrote: Err... Ehm... Well, did the same before posting! :-D But this http://www.brains-n-brawn.com/default.aspx?vDir=aicaptcha can defeat it. If it's human-readable, at the end, it WILL be defeated, no matter what. there are better alternatives to captchas, like riddles or simple mathematical problems, with the added benefit of being accessible.
Re: Warped Text...
On Sep 2, 2005, at 1:13 PM, Gregor J. Rothfuss wrote: there are better alternatives to captchas, like riddles Ah yes... :-) http://www.mwscomp.com/movies/grail/grail-23.htm
