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

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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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