CAPTCHA challenge incorporating obfuscated characters

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United States of America Patent

PATENT NO 9699176
SERIAL NO

15298551

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A method for determining if a user of a computer system is a human. A processor receives an indication that a computer security program is needed and acquires at least one image depicting a first string of characters including at least a first and second set of one or more characters. A processor assigns a substitute character to be used as input for each of the second set of one or more characters. A processor presents the at least one image and an indication of the substitute character and when to use the substitute character to the user. A processor receives a second string of characters from the user. A processor determines whether the second string of characters substantially matches the first string of characters based on the substitute character assigned to each of the second set of one or more characters and determines whether the user is a human.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINES CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Brown, Michael S Wahroonga, AU 344 8807
Franca, da Fonseca Carlos F Ermington, AU 5 66
Readshaw, Neil I Parkwood, AU 28 465

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