Re: [PHP] ASCII Captcha

On Fri, 2008-08-29 at 23:24 -0400, Eric Gorr wrote:
On Aug 29, 2008, at 11:16 PM, Robert Cummings wrote:

On Fri, 2008-08-29 at 23:05 -0400, Eric Gorr wrote:
On Aug 29, 2008, at 9:40 PM, Robert Cummings wrote:

On Fri, 2008-08-29 at 17:28 -0400, Eric Gorr wrote:
On Aug 29, 2008, at 5:19 PM, Robert Cummings wrote:

On Fri, 2008-08-29 at 16:54 -0400, Eric Gorr wrote:
On Aug 29, 2008, at 4:42 PM, Robert Cummings wrote:

On Fri, 2008-08-29 at 16:21 -0400, Eric Gorr wrote:
On Aug 29, 2008, at 4:09 PM, Robert Cummings wrote:

On Fri, 2008-08-29 at 15:52 -0400, Eric Gorr wrote:
On Aug 29, 2008, at 3:41 PM, Stut wrote:

I completely agree, but as far as I know it's only (and I
use
that
word carefully) people with both visual and audio
impairments
that
you cannot cater for.


I cannot see any reason why a person with both visual and
audio
impairments could not be presented with a test to prove they
are
human.

Go on, I'm all eyes and ears... describe such a test.


http://en.wikipedia.org/wiki/Captcha#Attempts_at_more_accessible_CAPTCHAs
discusses this.

And, I look forward to see what those doing research in this
area
come
up with in the future. It does seem obvious that since they are
human,
that a good test can be designed which does not rely on
security
through obscurity.

I said describe such a test... I didn't say describe current
thoughts
about such a test that have no practical implementation.

I pointed to such tests.

Pay special attention to the word "practical" used above before
shooting
something back off the top of your head.

Of course they have a practical implementation. They have been
implemented.

Implementation does not imply practicallity.

Implementations for space travel exist. Does it make space travel
for
everyone practical?

Now please return to paying special attention to the word
practical.
Feel free to dust off a dictionary if you must.

What is impractical about about an implementation asking a question
such as:

what is 3 + 5?
what color is the sky?

and then processing the answer entered?

The answer lies in the very article to which you referred me. These
are
easily crackable, and thus impractical.

By that illogical conclusion, all captcha's are impractical for all
are easily crackable and yet they have the very practical ability to
prevent an amount of spam that is quite beyond comprehension.

Care to try again?

All CAPTCHA's are not easily crackable. Some are quite difficult.

All someone has to do is hire someone to sit there and solve the
captcha's. There are places in this world which, unfortunately, employ
slave or virtually slave labor. If someone wants to fire that missile,
it is certainly possible.

They are _all_ easily crackable.

A human tending to a CAPTCHA is not cracked, the human is performing the
action for which the CAPTCHA was intended. While CAPTCHA's may be weak
to this kind of exploitation, this exploitation does not constitute a
crack.

Cheers,
Rob.
--
http://www.interjinn.com
Application and Templating Framework for PHP

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