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Javascript & Captcha

P: n/a
I noticed a lot of sites that do sign ups in Javascript seem to skip the
Captcha part. I just want to know...is it that safe or am I missing
something?
Oct 15 '08 #1
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9 Replies


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On Oct 15, 11:38*am, "Daniel Kaplan" <NoS...@NoSpam.comwrote:
I noticed a lot of sites that do sign ups in Javascript seem to skip the
Captcha part. *I just want to know...is it that safe or am I missing
something?
You are missing the explanation of what you actually want...
Oct 15 '08 #2

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"GArlington" <ga********@tiscali.co.ukwrote in message
news:85**********************************@s20g2000 prd.googlegroups.com...
On Oct 15, 11:38 am, "Daniel Kaplan" <NoS...@NoSpam.comwrote:
I noticed a lot of sites that do sign ups in Javascript seem to skip the
Captcha part. I just want to know...is it that safe or am I missing
something?
You are missing the explanation of what you actually want...

What I meant was...does doing a "sign up" or "register" routine via
Javascript somehow circumvent the need for using a CAPTCHA? I would think
no. But so many sites seem to be going that route.
Oct 15 '08 #3

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On Oct 15, 12:02*pm, "Daniel Kaplan" <NoS...@NoSpam.comwrote:
"GArlington" <garling...@tiscali.co.ukwrote in message

news:85**********************************@s20g2000 prd.googlegroups.com...
On Oct 15, 11:38 am, "Daniel Kaplan" <NoS...@NoSpam.comwrote:
I noticed a lot of sites that do sign ups in Javascript seem to skip the
Captcha part. I just want to know...is it that safe or am I missing
something?

You are missing the explanation of what you actually want...

What I meant was...does doing a "sign up" or "register" routine via
Javascript somehow circumvent the need for using a CAPTCHA? *I would think
no. *But so many sites seem to be going that route.
Hi, you can also do a CAPTCHA in JavaScript...like this one >>
http://cylo.co.uk/CAPTCHA.html

Graham
Oct 15 '08 #4

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Daniel Kaplan meinte:
What I meant was...does doing a "sign up" or "register" routine via
Javascript somehow circumvent the need for using a CAPTCHA? I would think
no. But so many sites seem to be going that route.
Why would you need a captcha for "sign up" or "register" at all? Apart
from annoying the visitors of your webpage.
Gregor

--
http://photo.gregorkofler.at ::: Landschafts- und Reisefotografie
http://web.gregorkofler.com ::: meine JS-Spielwiese
http://www.image2d.com ::: Bildagentur für den alpinen Raum
Oct 15 '08 #5

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On Oct 15, 1:57*pm, Gregor Kofler <use...@gregorkofler.atwrote:
Daniel Kaplan meinte:
What I meant was...does doing a "sign up" or "register" routine via
Javascript somehow circumvent the need for using a CAPTCHA? *I would think
no. *But so many sites seem to be going that route.

Why would you need a captcha for "sign up" or "register" at all? Apart
from annoying the visitors of your webpage.

Gregor

--http://photo.gregorkofler.at::: Landschafts- und Reisefotografiehttp://web.gregorkofler.com*::: meine JS-Spielwiesehttp://www.image2d.com* ** ::: Bildagentur für den alpinen Raum
Bots of course, DOH!
Oct 15 '08 #6

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In comp.lang.javascript message <SW*************@nntpserver.swip.net>,
Wed, 15 Oct 2008 14:57:56, Gregor Kofler <us****@gregorkofler.at>
posted:
>
Why would you need a captcha for "sign up" or "register" at all? Apart
from annoying the visitors of your webpage.
As a general remark : I find that which Google sometimes gives is often
hard to get right, whereas that which Wikipedia gives when a new URL is
entered in an article is easy to read. Presumably both are sufficiently
effective. I don't know whether, technically, they count as CAPCHAs.
SAM, Lasse, Martin might get different Wiki ones.

The Google one annoys me; the Wiki one does not.

--
(c) John Stockton, nr London, UK. ?@merlyn.demon.co.uk Turnpike v6.05 MIME.
Web <URL:http://www.merlyn.demon.co.uk/- FAQqish topics, acronyms & links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News.
Oct 15 '08 #7

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Dr J R Stockton wrote:
Gregor Kofler posted:
>Why would you need a captcha for "sign up" or "register" at all? Apart
from annoying the visitors of your webpage.

As a general remark : I find that which Google sometimes gives is often
hard to get right, whereas that which Wikipedia gives when a new URL is
entered in an article is easy to read. Presumably both are sufficiently
effective. I don't know whether, technically, they count as CAPCHAs.
Criteria for whether something counts as a *CAPTCHA* can be derived from the
meaning of the acronym: Completely Automated Public Turing test to tell
Computers and Humans Apart. Insofar any representation that is hard to
guess by a(n OCR) program counts as a CAPTCHA -- although the concept itself
is evidently flawed.

See also <http://en.wikipedia.org/wiki/CAPTCHA>
HTH

PointedEars
--
var bugRiddenCrashPronePieceOfJunk = (
navigator.userAgent.indexOf('MSIE 5') != -1
&& navigator.userAgent.indexOf('Mac') != -1
) // Plone, register_function.js:16
Oct 15 '08 #8

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Laser Lips meinte:
Check out my captcha to see a new concept of captch http://cylo.co.uk/CAPTCHA.html
Interesting. However, pitfalls like lack of activated JS or JS
compatibility remain.
>>* there are much less annyoing techniques, which are equally effective
Yeah I would agree with this too, ok point taken
A combination of honeypots, randomly generated field names, verification
via session variables, some simple content analysis (one could go for a
serious bayesian approach), a minimum time between delivery and
submission (no one fills out forms in 5 seconds).

All these measures are completely "invisible" and need no client-side
scripts.

Gregor
--
http://photo.gregorkofler.at ::: Landschafts- und Reisefotografie
http://web.gregorkofler.com ::: meine JS-Spielwiese
http://www.image2d.com ::: Bildagentur für den alpinen Raum
Oct 16 '08 #9

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On Oct 16, 12:18*am, Thomas 'PointedEars' Lahn <PointedE...@web.de>
wrote:
Dr J R Stockton wrote:
As a general remark : I find that which Google sometimes gives is often
hard to get right, whereas that which Wikipedia gives when a new URL is
entered in an article is easy to read. *Presumably both are sufficiently
effective. *I don't know whether, technically, they count as CAPCHAs.

Criteria for whether something counts as a *CAPTCHA* can ...
HTH
An impressively pointless response from the pointed one. Had I wanted
to know, or had it mattered, I would have looked it up. ISTM that you
behave like a badly-programmed AI - you really should see a good
psychiatrist or craniotomist.

--
(c) John Stockton, near London, UK. Posting with Google.
Mail: J.R.""""""""@physics.org or (better) via Home Page at
Web: <URL:http://www.merlyn.demon.co.uk/>
FAQish topics, acronyms, links, etc.; Date, Delphi, JavaScript, ....|
Oct 16 '08 #10

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