Interview with Tobias Engel
summary
SS7, the telecom backbone designed in the 1970s, contains almost no built‑in security and now thousands of operators and vendors can get access, so an attacker can track people worldwide just from a phone number, intercept calls and texts across borders (Ukrainian networks observed calls from Russia; a southern European operator saw tracking of politicians) and users can only mitigate by switching off devices. Sternraute GmbH now builds SS7 firewalls to filter malicious signaling at network borders because end‑to‑end encryption does not stop location tracking.
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