An anti-spam technique that was developed to block robots from spamming a site. CAPTCHA works by asking the user to answer a question or solve a problem (such as reading a bit of text in an image) that computers were supposedly incapable of solving but humans were.
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votes
1answer
266 views
Apache real time robot detection
Background
Our website is being
a. scraped - complete pages downloaded
b. spidered - complete pages and sub links followed
c. mined - specific files downloaded at high speed
by hundreds of ...
2
votes
2answers
280 views
Does anyone run a site with Pligg? What is the most effective way to stop spam sign ups? [duplicate]
Possible Duplicate:
How can I prevent spam on sites which I control?
Specifically trying to combat things like this! http://www.autopliggdotcom (didnt want to give them a link!)
2
votes
1answer
343 views
What Captcha Services are available for free?
I'm looking for a free captcha service for a html/css/php site. reCAPTCHA seems to be very famous. Is it effective? Are there maybe other good captcha services which are available for free?
6
votes
1answer
253 views
Self hosting of recaptcha-like system to digitise my uploaded books
From wikipedia
reCAPTCHA is a system ... that uses CAPTCHA to help digitize
the text of books while protecting websites from bots
I have a lot of scanned documents that I'd like to convert, ...
3
votes
4answers
214 views
Removing CAPTCHA is harmful for my forms?
I have some services on my site that developed by PHP , it seems having CAPTCHA in my registration form is decreasing registering users , I tend to remove CAPTCHA at least on my registering form , is ...
15
votes
7answers
1k views
Is reCaptcha now basically useless?
Is reCaptcha now basically useless?
I have read around the internet that reCaptcha has been broken, and spam bots easily overcome it. Has Google addressed this at all. Do they have any plans to fix ...
2
votes
4answers
200 views
Is it good idea to put a captcha on credit card payment form
Is it good idea to put a captcha on credit card payment form?
I am thinking to put one on my asp.net mvc application's payment section to make it more secure but I have never seen anybody doing ...
2
votes
1answer
101 views
Chinese CAPTCHAs
I need to implement a CAPTCHA for a Chinese (Simplified) website. Does anyone know how CAPTCHAs are normally presented on Chinese sites? I have seen some which just display standard decimal numbers ...
2
votes
2answers
416 views
Which languages are supported by reCAPTCHA?
The documentation states that "Any supported language code." is supported, but then says:
Which language is used in the interface for the pre-defined themes. The following languages are supported:
...
2
votes
2answers
107 views
Why are captcha fields so prevelant across the internet?
Seems to me that they are an easy way out and band aid solution to a problem that could be solved in other ways. I have never implemented a captcha field on a website and do not intend to in the ...
3
votes
1answer
164 views
Recaptcha statistics
Of late recaptcha images have become excessively difficult to decipher. Is there any way to get analytics on unsuccessful attempts before a successful one for your website? I'm pretty certain the ...
4
votes
3answers
498 views
How to tell whether spammers are bots or humans?
How can you tell if the people that are spamming your forum or website are in fact bots or human spammers?
Please note that the question is not about preventing spammers. It is to determine if the ...
2
votes
2answers
100 views
Strange spam posts not making sense [duplicate]
Possible Duplicate:
What kind of spam is this?
I'm running a web site with a forum where one small part is open for posting from unregistered users. The site uses captcha, but still some ...
1
vote
1answer
62 views
Problematic using Captcha on billing page
I have simple captcha on user page. I want make it refresh if user input incorrect captcha, I just wanna ask Should I do it or I just add a simple button to refresh it.
2
votes
2answers
695 views
Has anybody earned $0.25+ from each of a captcha (on your website) passing?
I am a real dummy in web monetizing schemes.
[ 1 ] informs that a captcha vendor:
"charges a fee of about 25 cents to 50 cents for each form that is filled out using a Type-In ad [captcha]... ...
3
votes
2answers
236 views
Localized CAPTCHA
What are effective CAPTCHA solutions that can have localized description, and CAPTCHA text itself is either language-neutral, or can be localized (for Polish language)? It is to be used to protect a ...
15
votes
8answers
346 views
Effective captcha solutions [duplicate]
Possible Duplicate:
How can I prevent spam on sites which I control?
ReCaptcha is all the rage at the moment,
Based on customer/user feedback, what other captcha or general human ...
