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SS7 Attacks

SS7 (Signaling System No. 7) is a set of telephony signaling protocols developed in 1975, which is used to set up and tear down telephone calls in most parts of the world-wide public switched telephone network (PSTN). The protocol also performs number translation, local number portability, prepaid billing, Short Message Service (SMS), and other services.

In 2008, several SS7 vulnerabilities were published that permitted the tracking of cell phone users. In 2014, the media reported a protocol vulnerability of SS7 by which anybody can track the movements of cell phone users from virtually anywhere in the world with a success rate of approximately 70%. In addition, eavesdropping is possible by using the protocol to forward calls and also facilitate decryption by requesting that each caller’s carrier release a temporary encryption key to unlock the communication after it has been recorded. Read more…