Adversary-induced keystream re-use on TETRA air-interface encrypted traffic using any TEA keystream generator. IV generation is based upon several TDMA frame counters, which are frequently broadcast by the infrastructure in an unauthenticated manner. An active adversary can manipulate the view of these counters in a mobile station, provoking keystream re-use. By sending crafted messages to the MS and analyzing MS responses, keystream for arbitrary frames can be recovered.
Nonces should be used for the present occasion and only once.
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
| Link | Tags |
|---|---|
| https://tetraburst.com/ | vendor advisory related |