Browse Prior Art Database

Secured Calls and Text Transfer

IP.com Disclosure Number: IPCOM000125951D
Original Publication Date: 2005-Jul-25
Included in the Prior Art Database: 2005-Jul-25
Document File: 2 page(s) / 634K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Mobile communication services are a growing industry. In the same way there is a need for security and privacy regarding the data transfer. Currently, in a GSM (Global System for Mobile Communications) network, there is no means for the participating users to authenticate themselves before a call is established between them or data like SMS (Short Message Service) is delivered. The idea to solve this problem is an authentication of the caller by the called party before a call is connected between them or some text information is transferred. This seamless method for HPLMN (Home Public Land Mobile Network) users uses the USSD (Unstructured Supplementary Service Data) which is an easy and inexpensive way to implement the solution. By that a caller will dial the number of the called party with an added USSD service code (for example "#142**#")(Fig. 1). This code will be transferred transparently through the visiting Network to the HLR (Home Location Register) of the HPLMN. The HPLMN HLR triggers a Network Initiated USSD towards the called party and indicates that the caller wishes to make a secured call. If the called party knows the code for the secured call, he will key in the secure code, and send a Mobile Initiated USSD to the HLR. HLR will validate this code against the one sent by the caller and trigger the Gateway MSC (Mobile Services Switching Center) [using a propriety MAP (Mobile Application Protocol) message] to setup the call towards the participating users.

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Secured Calls and Text Transfer

Idea: Satish Venkob, IN-Bangalore

Mobile communication services are a growing industry. In the same way there is a need for security and privacy regarding the data transfer. Currently, in a GSM (Global System for Mobile Communications) network, there is no means for the participating users to authenticate themselves before a call is established between them or data like SMS (Short Message Service) is delivered.

The idea to solve this problem is an authentication of the caller by the called party before a call is connected between them or some text information is transferred. This seamless method for HPLMN (Home Public Land Mobile Network) users uses the USSD (Unstructured Supplementary Service Data) which is an easy and inexpensive way to implement the solution.

By that a caller will dial the number of the called party with an added USSD service code (for example "#142*<secure code>*<called party number>#")(Fig. 1). This code will be transferred transparently through the visiting Network to the HLR (Home Location Register) of the HPLMN. The HPLMN HLR triggers a Network Initiated USSD towards the called party and indicates that the caller wishes to make a secured call. If the called party knows the code for the secured call, he will key in the secure code, and send a Mobile Initiated USSD to the HLR. HLR will validate this code against the one sent by the caller and trigger the Gateway MSC (Mobile Services Switching Center) [using...