Patent · US Expired

Challenge response messaging solution

US7447744B2 · kind B2 · utility

5Cited by

6References

13Claims

0Family size

Assignee

Microsoft Corporation · US

Inventors

Andrew Wallace · Bellevue, US
Neil K. Koorland · Issaquah, US
Erik Hedberg · Issaquah, US
Qiang Wang · Beijing, CN
Samuel J. Neely · Sammamish, US
Max G. Morris · Redmond, US
Saeed Noursalehi · Naperville, US

Key dates

Filing date	Jun 6, 2003
Grant date	Nov 4, 2008
Priority date	—
Expiry date	Aug 5, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH04L63/101
WIPO fieldDigital communication
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.