What is a TIMSI?
The TIMSI (Temporary IMSI) is a pseudo-random number generated from the IMSI (International Mobile Subscriber Identity) number.
GSM network operators utilized the TIMSI in order to remove the need to transmit the IMSI over-the-air. This helps to keep the IMSI more secure.
To track a GSM user via the IMSI/TIMSI, an eavesdropper must intercept the GSM network communication where the TIMSI is initially negotiated.
Additionlly, because the TIMSI is periodically renegotiated, the eavesdropper must intercept each additional TIMSI re-negotiation session.
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