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:
Mar. 01, 2011
Filed:
Dec. 28, 2006
Kent D. Rager, Gurnee, IL (US);
Joseph M. Hansen, Williams Bay, WI (US);
Kent D. Rager, Gurnee, IL (US);
Joseph M. Hansen, Williams Bay, WI (US);
Motorola Mobility, Inc., Libertyville, IL (US);
Abstract
An apparatus () used by a plurality of devices to authenticate an accessory () is configured to operate with a device () of the plurality of devices. The accessory () applies an authentication algorithm to a key and a challenge () received from the device () and generates a response () thereto. A challenge and response memory () stores a subset of a set of challenges () and pre-computed responses (). The enabling circuit transmits a challenge () to the accessory () and receives a received response () therefrom. The enabling circuit () also compares the received response () to the stored response () corresponding to the stored challenge () sent to the accessory (). The enabling circuit () is configured to generate a normal operation enabling signal that enables normal operation of the device when the received response () matches the stored response and is configured not to generate the normal operation enabling signal when the received response () does not match the stored response.