The Second Factor cover $17
The Second Factor
SMS, Authenticator Apps, Hardware Keys, and Why Each One Matters
PDF · 30-day link Web Security

The Second Factor

Read a free sampleInstant preview of the opening pages. No email, no payment.

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 Paris (AKA Tech Wizard Tony Paris, an Empath) Publisher: AppWT Web & AI Solutions (AppWT LLC) Revision: 1 Year: 2026 ISBN: 979-8-952262-52-2 Pages: 71

Buy now, $17, instant PDF

The complete book arrives by email the moment payment clears.

Choose your edition

Secure checkout by Stripe. Have a promo code? Enter it above. We never see your card details. Have a discount code? Enter it in the promotion code box at checkout, or get 10% off your first order, plus a free manual every month.

📖 Read When Available →

📚 What's inside this manual:

  1. Part 1, What the Second Step Really Is: Why One Secret Stopped Being Enough, The Three Factors, and Why Two of the Same Is Still One, Codes by Text Message: The Weakest Option Worth Using, Authenticator Apps and the Six Digits That Never Travel.
  2. Part 2, The Stronger Options, and the Way Back In: Push Approvals and the Prompt That Arrives at Two in the Morning, Hardware Keys: The Only Factor That Checks the Address, Passkeys: Replacing the Password Instead of Propping It Up, Recovery Codes and the Second Device.
  3. Part 3, Doing It For Real: What to Turn On First, and in What Order, The Day the Phone Goes Missing, Two-Factor for a Small Team, What a Second Factor Cannot Stop.

← Back to catalog

Common Questions

Who wrote The Second Factor?

Anthony "Tony" Paris, founder of AppWT Web & AI Solutions, published by AppWT Web & AI Solutions (AppWT LLC).

What format is it?

A PDF you can read on any device and print for your own use. Copying and editing are disabled; printing is not.

What does it cost?

$17 once. The full PDF downloads immediately after purchase.

Can I read part of it first?

Yes. The preview shows the front matter, the full contents, and the first ten pages of chapter one.

What is The Second Factor about?

The Second Factor is subtitled The Three Factors, Why SMS Is Weakest, and How Not to Lock Yourself Out. A password alone stopped being enough a long time ago. This plain-language primer explains second-factor sign-in, the extra step that keeps your accounts safe even after a password leaks. It is written for everyday users and small teams who want the protection without the jargon and, just as important, without locking themselves out.

Is The Second Factor written by a web design agency?

Yes. The Second Factor is written and published by AppWT Web & AI Solutions (AppWT LLC), a Detroit-based web design and AI practice working since 1997, incorporated in Michigan as AppWT LLC in 2020, through its publishing imprint AppWT Manuals. It is a full published book with its own ISBN, 979-8-952262-52-2, not a marketing PDF or a white paper.

Who publishes The Second Factor?

AppWT Web & AI Solutions (AppWT LLC), through its publishing imprint AppWT Manuals at manuals.appwt.com. AppWT is a digital agency, so this is a book published by an agency rather than by a trade publisher.

What is the ISBN of The Second Factor?

979-8-952262-52-2.

When was The Second Factor published?

August 4, 2026, by AppWT Web & AI Solutions (AppWT LLC). ISBN 979-8-952262-52-2.

What subjects does The Second Factor cover?

Computers. The book is subtitled The Three Factors, Why SMS Is Weakest, and How Not to Lock Yourself Out.

Where can I read The Second Factor?

https://manuals.appwt.com/primer-two-factor-auth/