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Breaking CAPTCHA
Felipe Maia
Member #6,190
September 2005
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I wouldn't say that CAPTCHA is something that you would learn if they breaked it, all you have to do it make it fancier and fancier and weirder until even humans won't be able to read.

Kitty Cat
Member #2,815
October 2002
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Every algorithm has weak points. The best way to find those weak points is to get people to look for them (eg. try to break the algo). Just pretending your code is "unbreakable", or that people are "going to break it anyway so don't bother", is not very conductive to developing an encryption algorithm.

--
"Do not meddle in the affairs of cats, for they are subtle and will pee on your computer." -- Bruce Graham

Anonymous
Member #3,724
July 2003

I personally am totally against CAPTCHAs as they totally break accessability (and prevent by bots from... I mean... um... nothing!). It would be funny if you provided an alt text for CAPTCHAs... ;D

Anyway... I'm convinced that our powerful machines with smart algorithms soon will be able to guess any CAPTCHA better than humans.

HoHo
Member #4,534
April 2004
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Usually there is a good reason for using CAPTCHAs, like preventing bots from doing stuff they shouldn't. E.g downloading everything from theunderdogs.

__________
In theory, there is no difference between theory and practice. But, in practice, there is - Jan L.A. van de Snepscheut
MMORPG's...Many Men Online Role Playing Girls - Radagar
"Is Java REALLY slower? Does STL really bloat your exes? Find out with your friendly host, HoHo, and his benchmarking machine!" - Jakub Wasilewski

kentl
Member #2,905
November 2002

Quote:

I'm convinced that our powerful machines with smart algorithms soon will be able to guess any CAPTCHA better than humans.

I am convinced that you are wrong. Even if OCR technology gets good enough to look past the noise in a captcha and read the text other measures can be taken.

Anonymous
Member #3,724
July 2003

Kent Larsson: OCR tech was around in the '50s. It's not like it's a new technlogy.

HoHo
Member #4,534
April 2004
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Yes, it is not new but even after more than fifty years it is still not very good :)

__________
In theory, there is no difference between theory and practice. But, in practice, there is - Jan L.A. van de Snepscheut
MMORPG's...Many Men Online Role Playing Girls - Radagar
"Is Java REALLY slower? Does STL really bloat your exes? Find out with your friendly host, HoHo, and his benchmarking machine!" - Jakub Wasilewski

Billybob
Member #3,136
January 2003

As PWNtcha explains you don't need super OCR to break CAPTCHAs, you just apply some image filters to make a better image for the OCR.

In any case, as the cracks improve, the CAPTCHAs will improve.

Kimmo: Did you put the right settings into the programs? I'm sure there's lots to tweak.

Anonymous
Member #3,724
July 2003

I don't know... there's too much damn stuff to read about. Always problems and worry...

Billybob
Member #3,136
January 2003

Yep, the life of a criminal is never easy. shifty eyes

Anonymous
Member #3,724
July 2003

Quote:

Yep, the life of a criminal is never easy. shifty eyes

>:(

Ron Ofir
Member #2,357
May 2002
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Hey! That same face goes to you for not telling your reasons! >:( or perhpas ;)?

Anonymous
Member #3,724
July 2003

Okay, OKAY! I'm gonna take over the world. Happy? :-/

Jonny Cook
Member #4,055
November 2003

Now see, if you would have said that in the first place then you wouldn't have had such a problem!

The face of a child can say it all, especially the mouth part of the face.

Anonymous
Member #3,724
July 2003

I'm not helped still.

kentl
Member #2,905
November 2002

Quote:

I'm not helped still.

Good, let's hope no one helps you either. You might be up to do something illegal.

Avenger
Member #4,550
April 2004

No offense, but this is stupid..

Anonymous
Member #3,724
July 2003

Quote:

No offense, but this is stupid..

Which is? ???

Derezo
Member #1,666
April 2001
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Your thread.

"He who controls the stuffing controls the Universe"

Avenger
Member #4,550
April 2004

Derezo said it.

To be precise, breaking encryption (which, as far as I can tell, this thread is about) is never done legally, with a few exeptions. So unless you are a secret CIA agent please dont ask such questions on this forum, thank you;).

Jonny Cook
Member #4,055
November 2003

Yeah... if you are asking people to help you do something potentially illegal and they refuse, you really don't have any right to get angry. Now, if you would just tell everyone why exactly you want to do this, maybe they would treat your thread with a little more respect. However, just the fact that you are trying to hide your intentions makes this whole thing seem awfully suspicious.

The face of a child can say it all, especially the mouth part of the face.

Billybob
Member #3,136
January 2003

Quote:

To be precise, breaking encryption (which, as far as I can tell, this thread is about) is never done legally

IANAL but as far as I know breaking encryption isn't illegal. If I remember correctly, though, the DMCA prevents reverse engineering programs, so you can't do that.
And a CAPTCHA is not encryption, it's a Turing Test.

Withholding information from someone is stupid, they'll get it one way or another, and it does nothing to cure the root of the problem.
However, he's witholding information from us, so I'm not entirely against witholding information from him.

Bruce Perry
Member #270
April 2000

I got one too. It means our posts about cats were removed because the initial comment about cats (the context) was removed. The rest of the e-mail sounds bad but I assume it doesn't apply in this case. :-X
[EDIT: oops, sorry >_<]

--
Bruce "entheh" Perry [ Web site | DUMB | Set Up Us The Bomb !!! | Balls ]
Programming should be fun. That's why I hate C and C++.
The brxybrytl has you.

Derezo
Member #1,666
April 2001
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The thread shouldn't be open anyways.

"He who controls the stuffing controls the Universe"

jhuuskon
Member #302
April 2000
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Quote:

If I remember correctly, though, the DMCA prevents reverse engineering programs, so you can't do that.

KimmoA falls under swedish law, and if it is alike finnish law (which happens to be a derivative of old swedish law), breaking encryption falls under the same category as opening other people's letters.

AFAIK breaking CAPTCHA isn't illegal per se, but it is, however, most of the time malevolent.

You don't deserve my sig.

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