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TETRA - clear firmware, no encryption at all ?

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Haax

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Sep 10, 2013
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United Kingdom
I have a few Tetra sets, all used in DMO, all mobiles and my portable have clear firmware in, no TEA of any kind.
However, In the CPS there is option to enable 'air encryption' and End to End encryption' which is enabled, and is for every contact.
I'm sure there is _some_ inherent encryption in Tetra - namely 'Air Interface encryption' - but i see no way to call another set or initiate an encrypted call or, in the CPS,
input a cipher key in the CPS after the 'air interface encryption' box is ticked and enabled.

Also I enabled 'sck' and 'dck' - this made no difference, i was unable to input a hex value in any of the fields.

Is there any way to 'get my feet wet' with even basic encryption on sets with 'clear' firmware ?
or would i need to flash firmware with a TEA cipher in to get experimenting ?

Not really wanting to re-flash my MTP850s fug with TEA firmware in case i lose features like DMO repeater.
 

Ubbe

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Sep 8, 2006
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6,931
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Stockholm, Sweden
End-to-End are special software in a sim card so you have to buy that to be able to use encryption.
You can reflash firmware to any kind of TEA without loosing any options like DMO repeater. But TEA terminals needs to be registred in a euro database, in holland I think, and as I understand they only do it to new terminals. So I do not know if you actually can have someone to flash your tetra terminals legally to TEA to be able to use sck and dck keys.

/Ubbe
 

Haax

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Joined
Sep 10, 2013
Messages
8
Location
United Kingdom
Excellent, That's interesting, that answered questions that for weeks i have been looking for clarification on, so many Thanks Ubbe. Much appreciated. i thought i was doing something wrong, and reading many Tetra pdf over and over again was not providing me an answer, just headaches.
Thankyou
 
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