Comments on: From CAPTCHA to PICTCHA http://www.ajatus.in/2009/10/from-captcha-to-pictcha/ A leading software services company committed to the development of world class integrated business solutions for the IT industry and also ERP solutions Mon, 06 Feb 2012 14:28:26 +0000 hourly 1 http://wordpress.org/?v=3.0 By: cheap bicycle http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-909 cheap bicycle Thu, 17 Mar 2011 17:01:28 +0000 http://www.ajatus.in/?p=264#comment-909 Ive been reading your blog and really like it. thanks for the great reads! do you ever do any cycling ? Ive been reading your blog and really like it. thanks for the great reads! do you ever do any cycling ?

]]> By: janmejay http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-268 janmejay Thu, 14 Jan 2010 19:39:35 +0000 http://www.ajatus.in/?p=264#comment-268 Do you want to subscribe to RSS ? Do you want to subscribe to RSS ?

]]> By: Online Pharmacy No Prescription http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-267 Online Pharmacy No Prescription Thu, 14 Jan 2010 17:16:59 +0000 http://www.ajatus.in/?p=264#comment-267 Excellent post, how can I subscribe to this? Excellent post, how can I subscribe to this?

]]> By: CertPal http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-254 CertPal Fri, 27 Nov 2009 08:57:02 +0000 http://www.ajatus.in/?p=264#comment-254 I agree that a computer will have to make some sort of intelligent picture recognition before attempting to pick one of the 3 answers. But if you know one of the three choices being presented is correct, why would you even bother. Pick one randomly and a bot should be able to submit spam. They seem to have corrected the problem by not suggesting answers anymore. Picture captchas are harder to get right as trans has suggested in his comment below. I agree that a computer will have to make some sort of intelligent picture recognition before attempting to pick one of the 3 answers. But if you know one of the three choices being presented is correct, why would you even bother. Pick one randomly and a bot should be able to submit spam.

They seem to have corrected the problem by not suggesting answers anymore. Picture captchas are harder to get right as trans has suggested in his comment below.

]]> By: CertPal http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-253 CertPal Fri, 27 Nov 2009 08:53:30 +0000 http://www.ajatus.in/?p=264#comment-253 Did you even go through the application ? The app actually suggests 3 possible answers to the user (It does not seem to do so anymore). Selecting one of the three answers is easy for a computer program. You dont have to type a N char word when the words are already presented to you. Try the application before you hail yourself as a 'probability guru' Did you even go through the application ? The app actually suggests 3 possible answers to the user (It does not seem to do so anymore). Selecting one of the three answers is easy for a computer program. You dont have to type a N char word when the words are already presented to you. Try the application before you hail yourself as a ‘probability guru’

]]> By: janmejay http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-92 janmejay Mon, 19 Oct 2009 21:41:01 +0000 http://www.ajatus.in/?p=264#comment-92 Thats right. It is a self learning algorithm. For each word you put the Pictcha becomes stronger Thats right. It is a self learning algorithm. For each word you put the Pictcha becomes stronger

]]> By: Tran Minh http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-63 Tran Minh Sat, 17 Oct 2009 03:21:52 +0000 http://www.ajatus.in/?p=264#comment-63 Your statistics knowledge is probably the worst. You dont event know how to calculate probability: probability to select 1 4-char word = A(4,28), for 5-char word= A(5,28), so on.. the rest for you to think of. Your statistics knowledge is probably the worst. You dont event know how to calculate probability:
probability to select 1 4-char word = A(4,28), for 5-char word= A(5,28), so on.. the rest for you to think of.

]]> By: trans http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-62 trans Sat, 17 Oct 2009 02:40:53 +0000 http://www.ajatus.in/?p=264#comment-62 It a good idea, but some obvious tags didn't fly. Like the picture of bicycles. "Bike" failed. It a good idea, but some obvious tags didn’t fly. Like the picture of bicycles. “Bike” failed.

]]> By: Girish Sahu http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-59 Girish Sahu Fri, 16 Oct 2009 19:18:44 +0000 http://www.ajatus.in/?p=264#comment-59 Hi CertPal i think although probability says its guessing possibility 33% but its nearly impossible to guess for a computer what it is until and unless a photo search algorithm is developed orwe name the photo. Hi CertPal i think although probability says its guessing possibility 33% but its nearly impossible to guess for a computer what it is until and unless a photo search algorithm is developed orwe name the photo.

]]> By: CertPal http://www.ajatus.in/2009/10/from-captcha-to-pictcha/comment-page-1/#comment-58 CertPal Fri, 16 Oct 2009 18:59:25 +0000 http://www.ajatus.in/?p=264#comment-58 There are a couple of things wrong there. The "pictcha" is suggesting 3 valid answers. That makes the probability of a bot getting the answer right - 33%. This is HUGE ! I wrote a list of other captcha techniques and why they are good / bad. <a href="http://www.certpal.com/blogs/2009/09/flavours-of-captcha/" rel="nofollow">Check it out </a>if it interests you There are a couple of things wrong there. The “pictcha” is suggesting 3 valid answers. That makes the probability of a bot getting the answer right – 33%. This is HUGE ! I wrote a list of other captcha techniques and why they are good / bad. Check it out if it interests you

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