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HIP
2005
Springer

Collaborative Filtering CAPTCHAs

10 years 14 days ago
Collaborative Filtering CAPTCHAs
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
Added 27 Jun 2010
Updated 27 Jun 2010
Type Conference
Year 2005
Where HIP
Authors Monica Chew, J. D. Tygar
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