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:
Nov. 17, 2015
Filed:
Jan. 30, 2012
Thomas Patrick Gallagher, Redmond, WA (US);
Venkataramann Renganathan, Sammamish, WA (US);
Brian Thomas Carver, Kirkland, WA (US);
Muhammed Serdar Soran, Seattle, WA (US);
Matthew Michael Swann, Bothell, WA (US);
Trace David Ferrier, Redmond, WA (US);
Thomas Patrick Gallagher, Redmond, WA (US);
Venkataramann Renganathan, Sammamish, WA (US);
Brian Thomas Carver, Kirkland, WA (US);
Muhammed Serdar Soran, Seattle, WA (US);
Matthew Michael Swann, Bothell, WA (US);
Trace David Ferrier, Redmond, WA (US);
Microsoft Technology Licensing, LLC, Redmond, WA (US);
Abstract
A canary value is used to validate a message from a non-web browser client application to a web server providing web services to mitigate cross-site forgery attacks. The canary value is generated by the server in party by applying a hash function to a user identifier and a time stamp. The server provides the canary value to the client application in response to receiving a message that does not have a canary or has an expired canary. The client application upon receiving an error message with a canary message will resend the prior message with the canary value present. The client application caches the canary value for subsequent messages until a new canary value is received. The canary value allows the server to ignore messages generated by the client application under control of an attacker.