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:
Dec. 15, 2009
Filed:
Feb. 13, 2004
Sanjay Kaniyar, Redmond, WA (US);
James T. Pinkerton, Sammamish, WA (US);
Bhupinder S. Sethi, Redmond, WA (US);
Sanjay Kaniyar, Redmond, WA (US);
James T. Pinkerton, Sammamish, WA (US);
Bhupinder S. Sethi, Redmond, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
The present invention protects against denial of service attacks on lookup or hash tables used to store state information for data transfer protocols used to transfer data between two host computers. Two hash tables are provided for holding state information, one for verified remote entities (i.e., those where the remote local address can be traced to a host), and one for unverified entities. A cryptographically secure hash is applied to packets from unverified remote entities, since these are the most likely to attempt attacks on the hash tables. The performance of the local server for packets from verified remote entities, however, is maintained.