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. 04, 2008
Filed:
Jun. 06, 2003
Andrew Wallace, Bellevue, WA (US);
Neil K. Koorland, Issaquah, WA (US);
Erik Hedberg, Issaquah, WA (US);
Qiang Wang, Redmond, WA (US);
Samuel J. Neely, Sammamish, WA (US);
Max G. Morris, Seattle, WA (US);
Saeed Noursalehi, Naperville, IL (US);
Andrew Wallace, Bellevue, WA (US);
Neil K. Koorland, Issaquah, WA (US);
Erik Hedberg, Issaquah, WA (US);
Qiang Wang, Redmond, WA (US);
Samuel J. Neely, Sammamish, WA (US);
Max G. Morris, Seattle, WA (US);
Saeed Noursalehi, Naperville, IL (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A method that determines if a sender's message is to be sent to a recipient is presented. A challenge module analyzes the message and sends a challenge message to the sender if the sender is not in the recipient's address store. The challenge message includes a pseudo unique token for the sender recipient pair such that the sender must respond differently to each challenge message for a particular message. In one embodiment, the challenge message requires the sender to obtain a certificate from a certificate authority or a set of authorities.