The way they keep bots from catching up is the math problem varies every
time, is sometimes addition, sometimes subtraction, and the two integers
are varied from 0 to 30 with the larger number varying on whether it is
first or second in the expression. Sure a powerful number cruncher could
eventually hack it, but a powerful number cruncher can crack most any
security scheme given time.
-----Original Message-----
From: Visually Impaired Computer Users' Group List
[mailto:[log in to unmask]] On Behalf Of Ana G
Sent: Wednesday, April 30, 2014 6:35 AM
To: [log in to unmask]
Subject: Re: [VICUG-L] Captcha
I've encountered variations of the math captcha that say things like,
"Write the colors in the following sentence" or "What is the third animal
in the sentence below." Once I ran into one that asked a question we all
know, like "What colors are in the U.S. flag." I suppose bots can
eventually figure them out, but it's probably harder if the text is buried
among other text.
Like Bill, I really like this method and wish it were more common.
On 4/30/2014 12:27 AM, Colin Howard wrote:
> The maths captia is a good idea, but botts would quickly learn the
> permutations if left in a standard format.
>
> However, say as an example the question is framed in one of the ways
> below, plus others of which I as yet have not thought:
>
> 3+15=
>
> Three plus fifteen equals
>
> 3 +15 =
>
> 3+ 15 =
>
> "3" + 15 "="
>
> . . .
>
> we can understand what is required, allowance needs be made to accept
> eighteen or 18, within and no quotes.
>
> Further, the site can pick up from whence the person is sending - i.e
> the States, Russia, U.K, France, Nigeria . . . then perhaps the captia
> could be questions the sender might be expected to know relating to
> the country from which they are sending.
>
> I am trying to think of something a UK citizen, or a UK visitor would
> be expected to know it is far more difficult than I thought!
>
> Sure you get the idea.
>
>
VICUG-L is the Visually Impaired Computer User Group List.
Archived on the World Wide Web at
http://listserv.icors.org/archives/vicug-l.html
Signoff: [log in to unmask]
Subscribe: [log in to unmask]
VICUG-L is the Visually Impaired Computer User Group List.
Archived on the World Wide Web at
http://listserv.icors.org/archives/vicug-l.html
Signoff: [log in to unmask]
Subscribe: [log in to unmask]
|
