Hardest captcha ever?

#1

Post by dalys » Fri, Mar 04, 2011, 1:50 PM UTC

Hardest captcha ever?
random.irb.hr

Re: Hardest captcha ever?

#2

Post by pluies_public » Fri, Mar 04, 2011, 2:18 PM UTC

I thought it had to be static, but no: the captcha actually changes at each page reload.

At least it will weed out the non-mathematicians easily...

Re: Hardest captcha ever?

#3

Post by noamsml » Fri, Mar 04, 2011, 2:18 PM UTC

Most of these are really easy. I got a partial derivative of a constant. And honestly, if you can't answer basic math questions, you probably have no use for a quantum random bit generator.

Re: Hardest captcha ever?

#4

Post by makmanalp » Fri, Mar 04, 2011, 2:19 PM UTC

Ha, by this logic, a large majority of the current world population aren't humans :)

Re: Hardest captcha ever?

#5

Post by shasta » Fri, Mar 04, 2011, 2:23 PM UTC

Sounds like a great way to stock up on fake accounts submitted by people who just want to know if they got the question right

Re: Hardest captcha ever?

#6

Post by loudmax » Fri, Mar 04, 2011, 2:24 PM UTC

It's a reverse captcha! If you answer too quickly it knows you're a computer.

Re: Hardest captcha ever?

#7

Post by merijnv » Fri, Mar 04, 2011, 2:25 PM UTC

makmanalp wrote: post #4

Ha, by this logic, a large majority of the current world population aren't humans :)

Well, to be fair the easiest captcha's are easy high school level equations and (as someone else already pointed out) if you can't solve these you have no business obtaining an account for extremely high quality quantum random numbers. (I believe they provide about 7.8 or 7.9 bits of entropy per byte)

Re: Hardest captcha ever?

#8

Post by TorbjornLunde » Fri, Mar 04, 2011, 2:30 PM UTC

Isn't using math questions to stop bots(computers), a bit like trying to stop tanks with barbed wire?

Re: Hardest captcha ever?

#9

Post by knowtheory » Fri, Mar 04, 2011, 2:33 PM UTC

shasta wrote: post #5

Sounds like a great way to stock up on fake accounts submitted by people who just want to know if they got the question right

i even made a typo in my login handle >_got the question right though.

Re: Hardest captcha ever?

#10

Post by nettdata » Fri, Mar 04, 2011, 2:34 PM UTC

merijnv wrote: post #7

makmanalp wrote: post #4

Ha, by this logic, a large majority of the current world population aren't humans :)

Well, to be fair the easiest captcha's are easy high school level equations and (as someone else already pointed out) if you can't solve these you have no business obtaining an account for extremely high quality quantum random numbers. (I believe they provide about 7.8 or 7.9 bits of entropy per byte)

I'll stick with Lavarand, thanks... good enough for my needs.

http://en.wikipedia.org/wiki/Lavarand