Sim Security; Radio Disable/Enable - Motorola MTP830 S Product Information Manual

The End-to-End Encryption (E2EE) feature resolves this issue by encrypting the voice information before it is packed
into the PDU. This message is also encrypted according to the over-the-air encryption of the TETRA standard. Thus,
when the base station decrypts the PDU containing voice information, the voice part remains protected by encryption
until the called radio receives the voice and decrypts it.
The Universal Crypto Module (UCM), located in the radio, carries out voice encryption. The UCM takes the voice
stream and encrypts this stream using a set of keys. Likewise, the UCM takes encrypted voice stream and using the
same keys decrypts back into clear voice.
The encryption of voice and data can be carried out using a dedicated SIM card reader.
In the end-to-end encryption feature, the radio notifies and informs whether the call, being made or received, is voice-
encrypted. The radio also provides with means to select a different key, delete keys, request new keys and change the
encryption mode of nondefined private calls.
This feature is relevant for group calls and private calls in TMO and DMO.

SIM Security

The SIM security consists of the following security functionality groups:
• Voice E2EE and related key management.
• Network access parameters and authentication.
• Key management for AIE.
• OPTA, modification, encryption, and transfer.
• AES for E2EE of SIM Interface and SIM-Terminal Authentication.
The SIM is an integrated circuit card, which holds a file system and an application. The application performs the
following actions:
• Generation of key stream segments (KSS).
• Synchronization for E2EE.
• TETRA authentication algorithm based on K key on the SIM.
• Key management for E2EE keys.
• SIM interface encryption and authentication using the AES.
The file system holds the following.
• Network access parameters as ITSI.
• Security class definition and authentication definition.
• Integrated circuit card identifier.
• SIM version number.
• Operative Tactical Address (OPTA).
The E2EE keys are also kept on the SIM. However, they are accessible for the SIM application only, thus E2EE key
management is transparent to the radio.
The keys for AIE remain on the radio. The SIM application handles AIE key management.

Radio Disable/Enable

A dispatcher can disable or enable the radio remotely.
When disabled, the radio does not participate in any voice call, SDS, or packet data activity and ignores all
supplementary services sent on the downlink. All visible and audible indications are disabled, and the radio appears to
be turned off. All user inputs (key presses, knob operation) are ignored, and the PEI interface is closed.
The radio continues to perform mobility management functions, such as roaming, to facilitate subsequent enabling (or
further disabling).
The radio stores the disabled/enabled state in the codeplug, so the unit remains in that state after turning on.
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