![]() a secure 2FA method, they are still used today. While text messages are no longer considered. A few years later, one-time passwords would be delivered in a text message. In the days of old, they used lists of one-time passwords printed on a sheet of paper. The most commonly used 2FA technique is the third one. It is also used for authorizing client applications on servers. The second one is frequently used for data protection on mobile devices. It is not suitable for regular use because the answers remain the same and can be easily compromised. The first technique is still used for recovering passwords via security questions. a phone number, a USB stick with a digital key, a list of codes printed on a sheet of paper etc.). ![]()
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