Two-factor authentication and modem: what they have in common

1. Step 1. Two-factor authentication — uses — SMS. Codes by SMS.
2. Step 2. SMS — works like — Electrical telegraph. A short text message is the heir of the telegram.
3. Step 3. Electrical telegraph — evolved into — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
4. Step 4. Telephone — is used in — Modem. It works over a telephone line.

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