The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 2013
Filed:
Aug. 10, 2011
Andrei Broder, Menlo Park, CA (US);
Anirban Dasgupta, Berkeley, CA (US);
Shanmugasundaram Ravikumar, Sunnyvale, CA (US);
Kunal Punera, San Francisco, CA (US);
Andrei Broder, Menlo Park, CA (US);
Anirban Dasgupta, Berkeley, CA (US);
Shanmugasundaram Ravikumar, Sunnyvale, CA (US);
Kunal Punera, San Francisco, CA (US);
Yahoo! Inc., Sunnyvale, CA (US);
Abstract
A system and method for implementing a multi-step challenge and response test includes steps or acts of: using an input/output subsystem for presenting a series of challenges to a user that require said user to correctly solve each challenge before a next challenge is revealed to the user; receiving the user's response to each challenge; and submitting a last response in the series of challenges to a server for validation. The method further includes: using a processor device configured to perform for each challenge in the series of challenges: internally validating the response by comparing the user's response to a correct response; and using the user's response, decrypting the next challenge to reveal the next challenge; wherein the next challenge remains obfuscated until a previous challenge is correctly solved.