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. 11, 2008
Filed:
Jul. 15, 2003
Sampo Sovio, Vantaa, FI;
Nadarajah Asokan, Espoo, FI;
Kaisa Nyberg, Helsinki, FI;
Valtteri Niemi, Helsinki, FI;
Sampo Sovio, Vantaa, FI;
Nadarajah Asokan, Espoo, FI;
Kaisa Nyberg, Helsinki, FI;
Valtteri Niemi, Helsinki, FI;
Nokia Corporation, Espoo, FI;
Abstract
The invention relates to a method for sharing the authorization to use specific resources among multiple devices, which resources are accessible via messages on which a secret key operation was applied with a predetermined secret master key d available at a master device. In order to provide an optimized sharing of authorization, it is proposed that the master devicesplits the secret master key d into two parts d, d. A piece of information relating to the first part dof the secret master key d is forwarded to the slave devicefor enabling this slave device to perform a partial secret key operation on a message m. The second part dof the secret master key d is forwarded to a serverfor enabling the serverto perform partial secret key operations on a message m received from the slave device