Patent application number | Description | Published |
20080267405 | System for ensuring encrypted communication after handover - During connection setup with a first radio access network, a multimode mobile station sends an unprotected initial signaling message that includes information about those encryption algorithms that the multimode mobile station supports when it communications in a second radio access network. The first radio access network saves some or all the information. Then it composes and sends an integrity-protected message that includes information about the encryption algorithms supported by the multimode mobile station in the second radio access network. | 10-30-2008 |
20090111428 | System and Method for Authenticating a Context Transfer - The user equipment (UE) and the Mobility Management Entity (MME) in an evolved 3GPP system generate authentication material that can be carried inside a packet switched network temporary mobile station identifier (P-TMSI) signature field of a Universal Mobile Telecommunications System (UMTS) signaling message from the UE to a UMTS/GPRS serving GPRS support node (SGSN) in a UMTS or GPRS Terrestrial Radio Access Network (UTRAN) or in a GSM/Edge Radio Access Network (GERAN), as well as from the SGSN to the MME of the evolved 3GPP system. The MME authenticates a context transfer request from the UTRAN/GERAN system based on the transferred authentication material and knowledge of how to create or to verify the authentication material. Additionally, the MME and the UE derive or verify authentication material, based on at least one user-specific key, for embedding in the P-TMSI signature field in legacy 3GPP signalling. | 04-30-2009 |
20090258631 | Mobility related control signalling authentication in mobile communications system - In a non-limiting and exemplary embodiment, a method is provided for arranging authentication of mobility related signalling messages in a mobile communications system. An authentication code is generated on the basis of a previous authentication code stored in connection with a preceding authentication code generation event. The newly generated authentication code is stored for subsequent authentication code generation event. In response to change of the mobile device to an access network of the network entity, a control message comprising the authentication code is transmitted from a mobile device to a first network entity, for verifying the authentication code by the first network entity or by a second network entity of a previous access system. | 10-15-2009 |
20090271623 | Intersystem mobility security context handling between different radio access networks - A method and apparatus for intersystem mobility security context handling between different radio access networks which can include a receiver configured to receive a tracking area update message from a user terminal. The message can include a first key identifier configured to identify a mapped security context and a second key identifier configured to identify a cached security context. A verifier can be configured to verify the tracking area update message with a key identified by the first or second key identifier. | 10-29-2009 |
20100014672 | Counter Initialization, Particularly For Radio Frames - A method for protecting traffic in a radio access network connected to at least two core networks. The method comprises maintaining a corenetwork-specific authentication protocol and a radio-bearer-specific ciphering process, and generating, for each ciphering process, a count parameter comprising a cyclical sequence number and a hyperframe number (HFN) which is incremented each time the cyclical sequence number completes one cycle. For each core network or authentication protocol, a first radio bearer of a session is initialized with a HFN exceeding the highest HFN used during the previous session. When a new radio bearer is established, the mobile station selects the highest HFN used during the session for the core network in question, increments it and uses it for initializing the count parameter for the new radio bearer. At the end of a session, the mobile station stores at least part of the highest HFN used during the session. | 01-21-2010 |
20130003971 | Identifiers in a Communication System - An identifier containing at least one encrypted part is received at a first network entity. A second network entity may then be determined based on the identifier. A request for assistance in decryption of the identifier from the second network entity may be sent from the first entity to the second network entity. The second network entity may then assist the first networks entity in an appropriate manner. | 01-03-2013 |
20130343540 | CIPHERING AS A PART OF THE MULTICAST CONCEPT - The invention proposes a method for transmitting a message to a plurality of user entities in a network by using a multicast service, comprising the steps of encrypting a multicast message by using ciphering, and sending the encrypted multicast message to the plurality of user entities simultaneously. The invention also proposes a corresponding multicast service control device and a corresponding user entity. | 12-26-2013 |
20140323091 | Integrity Check In A Communication System - A method of communication between a first node and a second node for a system where a plurality of different channels is provided between said first and second node. The method comprises the step of calculating an integrity output. The integrity output is calculated from a plurality of values, some of said values being the same for said different channels. At least one of said values is arranged to comprise information relating to the identity of said channel, each channel having a different identity. After the integrity output has been calculated, Information relating to the integrity output is transmitted from one of said nodes to the other. | 10-30-2014 |