For questions related to CAPTCHA, an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart", which is a type of challenge-response test used in computing to determine whether or not the user is human.
Questions tagged [captcha]
6 questions
3
votes
2 answers
Is such a captcha AI-resistant?
Let's say we have a captcha system that consists of a greyscale picture (of a part of a street or something akin to re-captcha), divided into 9 blocks, with 2 missing pieces.
You need to choose the appropriate missing pieces from over 15…
user38359
2
votes
2 answers
Why adversarial images are not the mainstream for captchas?
In order to check, whether the visitor of the page is a human, and not an AI many web pages and applications have a checking procedure, known as CAPTCHA. These tasks are intended to be simple for people, but unsolvable for machines.
However, often…
spiridon_the_sun_rotator
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How is the reCaptcha useful for Google?
I am wondering where Google uses the result from deep learning of reCaptcha (how can a system that knows to recognize street signs is useful somewhere? how they profit from it?)
hyperscience
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1
vote
1 answer
CAPTCHA based on text comprehension and random tokens
I developed a novel type of CAPTCHA based on text comprehension and random tokens. Given a task Pick the first pair of adjacent letters and a random token 8NBA596V, the user has to provide the solution NB. It offers basic protection and an attacker…
Robert Cerny
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How to prevent image recognition of my dataset with neural networks and make it hard to train them?
Suppose I have a private set of images containing some objects.
How do i
Make it very hard for the neural networks such as ImageNet to recognize these objects, while allowing humans to do it at the same time?
Suppose I label these private images -…
user38359
0
votes
1 answer
How can CAPTCHAs be used for both user verification and ML training?
CAPTCHAs (e.g. requiring a site visitor to click all the images of traffic lights in a grid of images) are often used throughout to Internet to verify that a site visitor is a human rather than a bot.
Many people claim that the providers of the…
tparker
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