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:
Oct. 15, 2013
Filed:
Dec. 28, 2011
Michael Wurm, Redwood City, CA (US);
Michael Wurm, Redwood City, CA (US);
SecureALL Corporation, Mountain View, CA (US);
Abstract
A mobile device (), e.g. a token, holds a current key and one or more previous (expired) keys in memory (). If the token needs to communicate with another device (), e.g. with a reader, and the reader does not have the current key but has a previous key, the token encrypts the current key with the previous key and sends the ciphertext to the reader, which decrypts the current key. The token use different cryptographic material for communication with respective different facilities. Rather than requesting the reader to identify the facility, the token assumes that the facility is the same as in the most recent successful authentication. If the authentication fails, only then the token requests the reader to identify the facility. Authentication time and electric power are saved if the facility is the same. Other embodiments are also provided.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile