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:
May. 02, 2017
Filed:
Jul. 03, 2015
Telefonaktiebolaget Lm Ericsson (Publ), Stockholm, SE;
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm, SE;
Abstract
A method and an arrangement for providing keys for protecting communication between a terminal () and service points in a communication network. A basic key (Ik) is first established with a service control node () when the terminal has entered the network. An initial modified key (Ik) is then created in both the service control node and the terminal, by applying a predetermined first function (f) to at least the basic key and an initial value of a key version parameter (v). The initial modified key is sent to a first service point (), such that it can be used to protect communication between the terminal and the first service point. When the terminal switches to a second service point (), the first service point and the terminal both create a second modified key (Ik) by applying a predetermined second function (g) to the initial modified key, and the first service point sends the second modified key to the second service point.