Patents by Inventor Ravindra Rajaram

Ravindra Rajaram has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Image-based completely automated public turing test to tell computers and humans apart (CAPTCHA)
    Patent number: 9600678
    Abstract: An image is selected responsive to receiving an access request for access to protected content. An access code is assigned to the image, and the image is partitioned into a plurality of image tiles. Each image tile comprises a code segment, which is a part of the access code. The image tiles are then scrambled into a scrambled version of the image and displayed to a user. The user rearranges the scrambled version of the image to reassemble the image, identifies a correct sequence for the code segments, and then enters the code segments in the correct sequence as a codeword. The codeword is matched against the assigned access code. If they match, the user is granted access to the protected content. Otherwise the person is denied access to the protected content.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: March 21, 2017
    Assignee: CA, Inc.
    Inventors: Naga Venkata Sunil Alamuri, Ravindra Rajaram