App-based two-factor authentication is similar in that the second step is generated on the smartphone itself. That’s not bad protection, but Google’s on-device prompt strategy (we’ll cover this later) was even better, blocking 99 percent of bulk phishing attacks, and 90 percent of targeted attacks. The trio found that SMS authentication blocked 96 percent of bulk phishing attacks, and 76 percent of targeted attacks trying to crack into your Google account. In May 2019, Google announced a one-year study it did in partnership with New York University and the University of California, San Diego. That said, SMS authentication is still far better than nothing. If you decide to get your 2FA codes via SMS, for example, the code could potentially be intercepted by hackers, as researchers for Positive Technologies demonstrated in 2017.
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