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:
Oct. 20, 2009
Filed:
Feb. 25, 2003
Iulian D. Calinov, Redmond, WA (US);
Danpo Zhang, Issaquah, WA (US);
Jonathan Wilkins, Seattle, WA (US);
Julien Couvreur, Kirkland, WA (US);
Josh Benaloh, Redmond, WA (US);
Iulian D. Calinov, Redmond, WA (US);
Danpo Zhang, Issaquah, WA (US);
Jonathan Wilkins, Seattle, WA (US);
Julien Couvreur, Kirkland, WA (US);
Josh Benaloh, Redmond, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
Methods and system of preventing unauthorized scripting. The invention includes providing one or more tests to a user for distinguishing the user from a machine when the user requests access to the server. By storing information on a correct solution to the test in a block of data and sending the block of data together with the test, the invention provides stateless operation. Moreover, maintaining a database of previously used correct responses prevents replay attacks. The invention also includes providing combinations of alternative tests, such as visually altered textual character strings, audible character strings, and computational puzzles. Other aspects of the invention are directed to computer-readable media for use with the methods and system.