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:
Apr. 10, 2012
Filed:
Apr. 03, 2006
Dirk Balfanz, Menlo Park, CA (US);
Cristina Lopes, San Francisco, CA (US);
Diana Smetters, Burlingame, CA (US);
Paul Stewart, Sunnyvale, CA (US);
Hao-chi Wong, San Carlos, CA (US);
Dirk Balfanz, Menlo Park, CA (US);
Cristina Lopes, San Francisco, CA (US);
Diana Smetters, Burlingame, CA (US);
Paul Stewart, Sunnyvale, CA (US);
Hao-Chi Wong, San Carlos, CA (US);
Palo Alto Research Center Incorporated, Palo Alto, CA (US);
Abstract
Pre-authentication information of devices is used to securely authenticate arbitrary peer-to-peer ad-hoc interactions. In one embodiment, public key cryptography is used in the main wireless link with location-limited channels being initially used to pre-authenticate devices. Use of public keys in the pre-authentication data allows for the broadening of types of media suitable for use as location-limited channels to include, for example, audio and infrared. Also, it allows a range of key exchange protocols which can be authenticated in this manner to include most public-key-based protocols. As a result, a large range of devices, protocols can be used in various applications. Further, an eavesdropper is forced to mount an active attack on the location-limited channel itself in order to access an ad-hoc exchange. However, this results in the discovery of the eavesdropper.