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Although SMS/Phone based authentication uses an out-of-band communications channel, it's an unsecured channel and is vulnerable to attacks including Phoney Letters of Authorization Sim-jacking SS7 Hacking Stingrays SS7 exploitation requires a more advanced attacker, and Stingrays are (in theory) confined to law enforcement usage, but the first two are inexpensive and require little sophistication to pull off.
Later, more sophisticated address signaling, including multi-frequency signaling methods, enabled direct-dialed long-distance calls by subscribers, culminating in the Signalling System 7 (SS7) network that controlled calls between most exchanges by the end of the 20th century. The growth of the PSTN was enabled by teletraffic engineering techniques to deliver quality of service (QoS) in the network.
It can also handle cellular location records, created when phones connect to various towers as their owners move around. [bold: SS7 (attacks) ] https://www.firstpoint-mg.com/blog/ss7-attack-guide/ https://www.bleepingcomputer.com/news/security/most-ss7-exploit-service-providers-on-dark-web-are-scammers/ >SS7 attacks are mobile cyber attacks that exploit security vulnerabilities in the SS7 protocol to compromise and...
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