A Guide to Common Types of Two-Factor Authentication on the Web


This is one of the best 2FA tutorials around, and I’ve read many. Most are lacking in many respects.

The classification is original and smart, since EFF sets apart a push-based 2FA category. Having a special paragraph for backup codes is also a good idea.

This addresses the general public, while covering some of the finer points that might not be obvious to more advanced users.

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