Patent · US Active

Methods and apparatuses for controlling access to computer systems and for annotating media files

US8555353B2 · kind B2 · utility

5Cited by

16References

25Claims

0Family size

Assignee

CARNEGIE MELLON UNIVERSITY · US

Inventors

Luis Von Ahn · Pittsburgh, US
Manuel Blum · Ottobrunn, DE
Benjamin D. Maurer · Menlo Park, US

Key dates

Filing date	Jan 23, 2008
Grant date	Oct 8, 2013
Priority date	—
Expiry date	Sep 30, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG06F2221/2133
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Methods and apparatuses for controlling access to computer systems and for annotating media files. One embodiment includes a method including generating a challenge to a user, wherein the challenge includes a verify part and a read part. The methods also includes prompting the user to solve both the verify part of the challenge and the read part of the challenge; receiving input from the user; determining if the input from the user relative to the verify part of the challenge corresponds with the known answer for the verify part of the challenge; and identifying the input from the user relative to the read part of the challenge as an answer to the read part of the challenge, if the input from the user relative to the verify part of the challenge corresponds with the known answer for the verify part of the challenge.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.