Using WolframAlpha to Hack Text CAPTCHA

Re:Using WolframAlpha to Hack Text CAPTCHA by notyourwork on Wednesday November 10, 2010 @02:18PM (#1891476)

This is a very interesting application of WolframAlpha but it appears to be purely luck when "success" was the result. Using things such as "2nd item in a..." or "7th digit in..." work in a lot of cases but lets talk about a few.

"2nd fruit in bear apple goat orange" would result in apple because it is looking for second in a list and neglects context of fruit.

"7th digit in abc123def456ghi789 " would result in d when it should be 7. Again not understanding context and merely looking at logical construction.

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Re:Using WolframAlpha to Hack Text CAPTCHA by pygy_ on Wednesday November 10, 2010 @02:42PM (#1891533)

> "2nd fruit in bear apple goat orange"[1], "7th digit in abc123def456ghi789"[2]

It barfs on these ones, but not like you predict (it's actually worse). "The 2nd colour in purple, belly, yellow, arm, white and blue"[3] gives back yellow, though, so it's not that stupid.

[1] http://www.wolframalpha.com/input/?i=The+2nd+fruit+in+bear+a...

[2] http://www.wolframalpha.com/input/?i=7th+digit+in+abc123def4...

[3] http://www.wolframalpha.com/input/?i=The+2nd+colour+in+purpl...

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Re:Using WolframAlpha to Hack Text CAPTCHA by mquander on Wednesday November 10, 2010 @02:46PM (#1891547)

Oh, not that stupid, huh?

Query: The 2nd colour in purple, belly, yellow, arm, white and blue

Answer: yellow

Query: The 3rd colour in purple, belly, yellow, arm, white and blue

Answer: yellow

Query: The 7th colour in purple, belly, yellow, arm, white and blue

Answer: yellow

Query: The bluest colour in purple, belly, yellow, arm, white and blue

Answer: yellow

:-)

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Re:Using WolframAlpha to Hack Text CAPTCHA by ahlatimer on Thursday November 11, 2010 @04:41AM (#1893411)

If you change yellow to silver, it gives you "colour silver," but if you look at the assumptions, it assumes silver is an element. Clearly it's not really getting the meaning of the sentence, and the fact that it's picking "yellow" is mostly coincidental, I think, as is also illustrated by your examples.

http://www.wolframalpha.com/input/?i=The+2nd+colour+in+blue,...

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Re:Using WolframAlpha to Hack Text CAPTCHA by VeXocide on Wednesday November 10, 2010 @06:15PM (#1892163)

I wonder what its favorite colour is ;-)

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Re:Using WolframAlpha to Hack Text CAPTCHA by MarcusAurelius on Wednesday November 10, 2010 @06:40PM (#1892217)

Try it: http://www.wolframalpha.com/input/?i=what+is+your+favorite+c...

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Re:Using WolframAlpha to Hack Text CAPTCHA by moeffju on Thursday November 11, 2010 @05:58AM (#1893524)

That's according to Python. Ask about the favorite color of Wolfram Alpha:

http://www.wolframalpha.com/input/?i=what+is+your+favorite+c...

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Re:Using WolframAlpha to Hack Text CAPTCHA by joelvh on Wednesday November 10, 2010 @02:59PM (#1891602)

Haha.

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Re:Using WolframAlpha to Hack Text CAPTCHA by kevindication on Wednesday November 10, 2010 @04:57PM (#1891938)

I immediately wondered the same thing. An example from their questions was:

Q: "Which word contains “z” from the list: zoologist, midwifery, spiderweb, crimps?" A: "zoologist"

But what if you change up that list a bit?

Q: "Which word contains “z” from the list: action, jackson, midwifery, zoologist, spiderweb, crimps?" A: "jackson"

Alpha's sentence digestion has always left me going: huh?

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Re:Using WolframAlpha to Hack Text CAPTCHA by joelvh on Wednesday November 10, 2010 @02:23PM (#1891493)

Right. And as a little experiment, it was surprising the results I got. It also implies that it is not hard to structure the sentences in a way that makes it harder for WolframAlpha's algorithms to get the right answer. But doing that for 180 million questions? I wonder what the percentage of success using only WolframAlpha would be on the whole data set.

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