4 Use of the GPRS ciphering algorithm

3GPP41.061General Packet Radio Service (GPRS)GPRS ciphering algorithm requirementsRelease 4TS

This clause defines those organizations for whom the algorithm is intended, describe the type of information which the algorithm is intended to protect, indicate possible geographical/geopolitical restrictions on the use of equipment which embodies the algorithm, and describe the types of implementations of the algorithm that are envisaged.

4.1 Use of the algorithm

The algorithm shall only be used for providing GPRS security features, as described in GSM 02.60 and GSM 03.60.

The use of the algorithm is as follows:

– the algorithm is used to provide confidentiality and integrity protection of GPRS user data used for Point-to-Point (PTP) mobile originated and mobile terminated data transmission;

– the algorithm is used to provide data confidentiality and integrity protection of GPRS user data used for Point-to-Multipoint Group (PTM-G) mobile terminated data transmission.

– the algorithm is restricted to the MS – SGSN encryption.

4.2 Places of use

The algorithm is installed in the Serving GPRS Support Node (SGSN) and Mobile Station (MS). The MS may consist of Terminal Equipment (TE), Terminal adaptation (TA) and Mobile Equipment (ME). The MS may also be a stand alone device. The GPRS ciphering algorithm may reside in the ME, TA, TE.

Legal restrictions on the use or export of equipment containing cryptographic features that are enforced by various European Governments may prevent the use of equipment in certain countries.

4.3 Types of implementation

An algorithm with minimal restrictions on export when licensed and managed as described in clause 5, is desired because of the global use of GSM.

The preferred method for implementing the algorithm is in hardware as a single chip device .

In the case of a software implementation of the algorithm, legal restrictions on its export and, in certain countries, on its use is expected to be more stringent than for a hardware implementation.