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Two-Factor Authentication Explained cover $0.97
Two-Factor Authentication Explained
SMS, Authenticator Apps, Hardware Keys — and Why Each One Matters
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Two-Factor Authentication Explained

SMS, Authenticator Apps, Hardware Keys — and Why Each One Matters

Primer on two-factor authentication. The three factors, why SMS is the weakest, why authenticator apps win, when hardware keys make sense.

Who this is for: Anyone with online accounts.

Available across: USA, UK, Canada, Australia. Multi-English spelling throughout (color/colour, optimize/optimise).

Author: Anthony P. Paris (Tony) Publisher: AppWT Web & AI Solutions (AppWT LLC) Revision: 1 Year: 2026 Pages: 13
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What's inside:

  1. The three factors: something you know, have, and are
  2. Why SMS codes are the weakest option still worth using
  3. Authenticator apps, and why they work offline
  4. Hardware keys: when they are worth it
  5. Backup codes, and where people lose them
  6. Recovering an account when you lose the second factor

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