2-36 Services and Feature Description
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual March 2009
12 Security Services
The terminal provides TETRA security features as described in the TETRA standard [Ref 3] clause
28, and the TIPs [Ref 15], [Ref 16].
Unless stated otherwise, this chapter describes security services in TMO Mode only.
12.1 Terminal Equipment Identifier
The TEI will be programmed into the terminal at the factory and cannot be subsequently modified.
12.2 User Authentication
User authentication provides the basic protection mechanism against unauthorized terminal
operation on the network. It is based on a common authentication key (K) shared by the terminal
and the SwMI and used in a challenge-response-result protocol initiated by the SwMI during the
registration process.
The terminal supports SwMI initiated user authentication as defined in [Ref 3] Clause 4, using the
TA11 algorithm to derive the Session Key (KS) and the TA12 algorithm to derive the expected result
(XRES1) expected in the SwMI response.
If the terminal is provisioned for mutual authentication, whenever the terminal is authenticated by
the SwMI it will authenticate the SwMI. Mutual authentication can be configured as mandatory.
Note: Terminal initiated authentication of the SwMI is not supported.
Agenda to the picture above
• ITSI: Individual TETRA Subscriber Identity
• K: Authentication key – unique for each terminal
• GTSI: Group TETRA Subscriber Identity
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