Hi moltonel You wrote: > I'm worried about bots still having a very high chance of sucess. With > two fairly-legible words in the image and a chalenge asking me to > write either one of the words or both, a bot still has 33% chance of > success if answering randomly
I can't follow what 33% means and why you are more worried than about the usual CAPTCHAs: The known word (the one which is more scrambled) in our ReMAPTCHA currently consists of 5 characters, and the word is placed anywhere in the image - slightly tilted. This makes it at least as difficult as usual CAPTCHAs. Yours, Stefan 2014-03-29 14:21 GMT+01:00 moltonel 3x Combo <[email protected]>: > On 28/03/2014, Stefan Keller <[email protected]> wrote: > > The ReMAPTCHA Demo BETA 0.2 finally is ready to be tested: > > http://remaptcha.herokuapp.com/ > > Great, looks promising :) > > > Please note that perfomance is slow (so hover over satellite icon taks > > seconds), and that the data is restricted to Switzerland since that's the > > imagery data I needed (if anyone knows freely accessible aerial/satellite > > imagery of similar quality I'm interested). > > > > I'm open for hints and enhancement requests (excuse me that I can't > answer > > then all). > > I'm worried about bots still having a very high chance of sucess. With > two fairly-legible words in the image and a chalenge asking me to > write either one of the words or both, a bot still has 33% chance of > success if answering randomly, wich is high enough that bot authors > won't even bother trying to smartly interpret the map. > > The most direct way to reduce those odds is to put many words in the > picture. But that'll quickly get messy and as annoying as traditional > captchas. How about getting rid of words alltogether ? > > First of all, display only the satellite imagery, because the map > rendering is too parseable for computers, and not really necessary for > humans. Then ask the user to click on specific areas of the image, > using your knowledge of the underlying map data. Some challenge > examples : > * Click on the car park if you can reach it from the motorway, > otherwise click the big building. > * Click on the playground, then the fountain, then the lake > * Click on the road that leads to the football pitch > * Click on one of the park entrances >
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