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14

HIP
2005
Springer

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Collaborative Filtering CAPTCHAs

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Collaborative Filtering CAPTCHAs

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Abstract. Current CAPTCHAs require users to solve objective questions such as text recognition or image recognition. We propose a class of CAPTCHAs based on collaborative ﬁltering. Collaborative ﬁltering CAPTCHAs allow us to ask questions that have no absolute answer; instead, the CAPTCHAs are graded by comparison to other people’s answers. We analyze the security requirements of collaborative ﬁltering CAPTCHAs and ﬁnd that although they are not ready to use now, collaborative ﬁltering CAPTCHAs are worthy of further investigation.

Monica Chew, J. D. Tygar

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Captchas | CAPTCHAs Require Users | Collaborative ﬁltering Captchas | Cryptography | HIP 2005 |

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Added	27 Jun 2010
Updated	27 Jun 2010
Type	Conference
Year	2005
Where	HIP
Authors	Monica Chew, J. D. Tygar

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