There are known vulnerabilities in mobile phone networks that enable eavesdropping of voice and SMS (text) communications. What has changed: NIST issued a DRAFT publication that is now explicitly warning of this vulnerability (NIST Pub 800-63B, Sec. 22.214.171.124. Out of Band Verifiers). Also, an ‘exploit kit’ is available on the ‘Dark Web’ for a few hundred dollars enabling an attacker with minimal technical skill to ‘hack’ your mobile phone (BBC did a great piece with a layman’s description how this works). Consequently, two-factor authentication using ‘verification codes’ via text should not be considered secure.
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