[cryptography] CAPTCHA as a Security System?

Jeffrey Walton noloader at gmail.com
Mon Jan 2 15:44:45 EST 2012


On Mon, Jan 2, 2012 at 2:03 PM, Marcus Brinkmann
<marcus.brinkmann at ruhr-uni-bochum.de> wrote:
> On 01/02/2012 06:58 PM, Jeffrey Walton wrote:
>> I was reading "CAPTCHA: Using Hard AI Problems For Security" by Ahn,
>> Blum, Hopper, and Langford (www.captcha.net/captcha_crypt.pdf).
>>
>> I understand how recognition is easy for humans and hard for computer
>> programs.
>
> But is that really true?
>
> My personal experience with CAPTCHAs is that they are increasingly hard to
> decipher for humans.  Has the scale already tipped over in favor of computer
> programs?
Agreed.

Jeff



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